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2680649 = 6134373
BaseRepresentation
bin1010001110011101001001
312001012011022
422032131021
51141240044
6133242225
731533206
oct12163511
95035138
102680649
111571014
12a93375
1372b1aa
144dacad
1537e3ee
hex28e749

2680649 has 4 divisors (see below), whose sum is σ = 2685636. Its totient is φ = 2675664.

The previous prime is 2680631. The next prime is 2680661. The reversal of 2680649 is 9460862.

2680649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9460862 = 24730431.

It can be written as a sum of positive squares in 2 ways, for example, as 525625 + 2155024 = 725^2 + 1468^2 .

It is a cyclic number.

It is not a de Polignac number, because 2680649 - 28 = 2680393 is a prime.

It is a super-2 number, since 2×26806492 = 14371758122402, which contains 22 as substring.

It is a d-powerful number, because it can be written as 221 + 64 + 8 + 0 + 66 + 46 + 96 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2680609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1574 + ... + 2799.

It is an arithmetic number, because the mean of its divisors is an integer number (671409).

22680649 is an apocalyptic number.

It is an amenable number.

2680649 is a deficient number, since it is larger than the sum of its proper divisors (4987).

2680649 is an equidigital number, since it uses as much as digits as its factorization.

2680649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4986.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 2680649 is about 1637.2687622990. The cubic root of 2680649 is about 138.9142026986.

The spelling of 2680649 in words is "two million, six hundred eighty thousand, six hundred forty-nine".

Divisors: 1 613 4373 2680649