265797690 has 64 divisors (see below), whose sum is σ = 656916480. Its totient is φ = 68793920.

The previous prime is 265797671. The next prime is 265797691. The reversal of 265797690 is 96797562.

It is a super-2 number, since 2×265797690² = 141296824018672200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (265797691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 183991 + ... + 185429.

It is an arithmetic number, because the mean of its divisors is an integer number (10264320).

Almost surely, 2^265797690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 265797690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328458240).

265797690 is an abundant number, since it is smaller than the sum of its proper divisors (391118790).

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

265797690 is a wasteful number, since it uses less digits than its factorization.

265797690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627.

The product of its (nonzero) digits is 1428840, while the sum is 51.

The square root of 265797690 is about 16303.3030395684. The cubic root of 265797690 is about 642.9596724650.

The spelling of 265797690 in words is "two hundred sixty-five million, seven hundred ninety-seven thousand, six hundred ninety".