265638856 has 32 divisors (see below), whose sum is σ = 570444480. Its totient is φ = 113601600.

The previous prime is 265638851. The next prime is 265638859. The reversal of 265638856 is 658836562.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (265638851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22666 + ... + 32326.

It is an arithmetic number, because the mean of its divisors is an integer number (17826390).

Almost surely, 2^265638856 is an apocalyptic number.

It is an amenable number.

265638856 is an abundant number, since it is smaller than the sum of its proper divisors (304805624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

265638856 is a wasteful number, since it uses less digits than its factorization.

265638856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10165 (or 10161 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 49.

The square root of 265638856 is about 16298.4310901387. The cubic root of 265638856 is about 642.8315747809.

The spelling of 265638856 in words is "two hundred sixty-five million, six hundred thirty-eight thousand, eight hundred fifty-six".