865552812 has 12 divisors (see below), whose sum is σ = 2019623256. Its totient is φ = 288517600.

The previous prime is 865552811. The next prime is 865552837. The reversal of 865552812 is 218255568.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×865552812² = 1498363340722214688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (865552811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36064689 + ... + 36064712.

It is an arithmetic number, because the mean of its divisors is an integer number (168301938).

Almost surely, 2^865552812 is an apocalyptic number.

It is an amenable number.

865552812 is an abundant number, since it is smaller than the sum of its proper divisors (1154070444).

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

865552812 is a wasteful number, since it uses less digits than its factorization.

865552812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72129408 (or 72129406 counting only the distinct ones).

The product of its digits is 192000, while the sum is 42.

The square root of 865552812 is about 29420.2789245785. The cubic root of 865552812 is about 953.0108765940.

The spelling of 865552812 in words is "eight hundred sixty-five million, five hundred fifty-two thousand, eight hundred twelve".