265643880 has 32 divisors (see below), whose sum is σ = 796932000. Its totient is φ = 70838336.

The previous prime is 265643863. The next prime is 265643891. The reversal of 265643880 is 88346562.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1106730 + ... + 1106969.

It is an arithmetic number, because the mean of its divisors is an integer number (24904125).

Almost surely, 2^265643880 is an apocalyptic number.

265643880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

265643880 is an abundant number, since it is smaller than the sum of its proper divisors (531288120).

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

265643880 is a wasteful number, since it uses less digits than its factorization.

265643880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213713 (or 2213709 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 265643880 is about 16298.5852146743. The cubic root of 265643880 is about 642.8356273575.

The spelling of 265643880 in words is "two hundred sixty-five million, six hundred forty-three thousand, eight hundred eighty".