865000880 has 20 divisors (see below), whose sum is σ = 2011127232. Its totient is φ = 346000320.

The previous prime is 865000847. The next prime is 865000889. The reversal of 865000880 is 88000568.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 865000880.

It is not an unprimeable number, because it can be changed into a prime (865000889) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5406176 + ... + 5406335.

Almost surely, 2^865000880 is an apocalyptic number.

865000880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

865000880 is an abundant number, since it is smaller than the sum of its proper divisors (1146126352).

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

865000880 is a wasteful number, since it uses less digits than its factorization.

865000880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10812524 (or 10812518 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 865000880 is about 29410.8973001505. The cubic root of 865000880 is about 952.8082665647.

The spelling of 865000880 in words is "eight hundred sixty-five million, eight hundred eighty", and thus it is an aban number.