265055780 has 72 divisors (see below), whose sum is σ = 618468480. Its totient is φ = 94628800.

The previous prime is 265055761. The next prime is 265055801. The reversal of 265055780 is 87550562.

It is a super-2 number, since 2×265055780² = 140509133022816800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1108901 + ... + 1109139.

It is an arithmetic number, because the mean of its divisors is an integer number (8589840).

Almost surely, 2^265055780 is an apocalyptic number.

265055780 is a gapful number since it is divisible by the number (20) 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 265055780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309234240).

265055780 is an abundant number, since it is smaller than the sum of its proper divisors (353412700).

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

265055780 is a wasteful number, since it uses less digits than its factorization.

265055780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 38.

The square root of 265055780 is about 16280.5337750333. The cubic root of 265055780 is about 642.3608928353.

The spelling of 265055780 in words is "two hundred sixty-five million, fifty-five thousand, seven hundred eighty".