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2663681 = 891732
BaseRepresentation
bin1010001010010100000001
312000022212212
422022110001
51140214211
6133031505
731432556
oct12122401
95008785
102663681
11155a299
12a85595
13723557
144d4a2d
1537938b
hex28a501

2663681 has 6 divisors (see below), whose sum is σ = 2709270. Its totient is φ = 2618528.

The previous prime is 2663677. The next prime is 2663693. The reversal of 2663681 is 1863662.

It can be written as a sum of positive squares in 3 ways, for example, as 1123600 + 1540081 = 1060^2 + 1241^2 .

It is not a de Polignac number, because 2663681 - 22 = 2663677 is a prime.

It is a super-2 number, since 2×26636812 = 14190392939522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2663651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15311 + ... + 15483.

It is an arithmetic number, because the mean of its divisors is an integer number (451545).

22663681 is an apocalyptic number.

It is an amenable number.

2663681 is a deficient number, since it is larger than the sum of its proper divisors (45589).

2663681 is an frugal number, since it uses more digits than its factorization.

2663681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435 (or 262 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 2663681 is about 1632.0787358458. The cubic root of 2663681 is about 138.6204819021.

The spelling of 2663681 in words is "two million, six hundred sixty-three thousand, six hundred eighty-one".

Divisors: 1 89 173 15397 29929 2663681