2620649 has 4 divisors (see below), whose sum is σ = 2647764. Its totient is φ = 2593536.

The previous prime is 2620637. The next prime is 2620661. The reversal of 2620649 is 9460262.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2620637) and next prime (2620661).

It can be written as a sum of positive squares in 2 ways, for example, as 2050624 + 570025 = 1432^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 2620649 - 2⁴ = 2620633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2620619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13412 + ... + 13605.

It is an arithmetic number, because the mean of its divisors is an integer number (661941).

2^2620649 is an apocalyptic number.

It is an amenable number.

2620649 is a deficient number, since it is larger than the sum of its proper divisors (27115).

2620649 is an equidigital number, since it uses as much as digits as its factorization.

2620649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27114.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 2620649 is about 1618.8418699799. The cubic root of 2620649 is about 137.8699502949.

The spelling of 2620649 in words is "two million, six hundred twenty thousand, six hundred forty-nine".