215807884840 has 64 divisors (see below), whose sum is σ = 498413217600. Its totient is φ = 84066866688.

The previous prime is 215807884819. The next prime is 215807884913. The reversal of 215807884840 is 48488708512.

It is a happy number.

215807884840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×215807884840² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174789 + ... + 679828.

It is an arithmetic number, because the mean of its divisors is an integer number (7787706525).

Almost surely, 2^215807884840 is an apocalyptic number.

215807884840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215807884840 is an abundant number, since it is smaller than the sum of its proper divisors (282605332760).

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

215807884840 is a wasteful number, since it uses less digits than its factorization.

215807884840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854794 (or 854790 counting only the distinct ones).

The product of its (nonzero) digits is 4587520, while the sum is 55.

The spelling of 215807884840 in words is "two hundred fifteen billion, eight hundred seven million, eight hundred eighty-four thousand, eight hundred forty".