265380864 has 264 divisors, whose sum is σ = 862491168. Its totient is φ = 72253440.

The previous prime is 265380859. The next prime is 265380887. The reversal of 265380864 is 468083562.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 6171627 + ... + 6171669.

It is an arithmetic number, because the mean of its divisors is an integer number (3267012).

Almost surely, 2^265380864 is an apocalyptic number.

265380864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 265380864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (431245584).

265380864 is an abundant number, since it is smaller than the sum of its proper divisors (597110304).

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

265380864 is a wasteful number, since it uses less digits than its factorization.

265380864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 96 counting only the distinct ones).

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

The square root of 265380864 is about 16290.5145406767. The cubic root of 265380864 is about 642.6233985053.

The spelling of 265380864 in words is "two hundred sixty-five million, three hundred eighty thousand, eight hundred sixty-four".