215878203968 has 84 divisors (see below), whose sum is σ = 510477977772. Its totient is φ = 90262609920.

The previous prime is 215878203953. The next prime is 215878203997. The reversal of 215878203968 is 869302878512.

It can be written as a sum of positive squares in 2 ways, for example, as 90499892224 + 125378311744 = 300832^2 + 354088^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 710921 + ... + 968072.

It is an arithmetic number, because the mean of its divisors is an integer number (6077118783).

Almost surely, 2^215878203968 is an apocalyptic number.

215878203968 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

215878203968 is an abundant number, since it is smaller than the sum of its proper divisors (294599773804).

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

215878203968 is a wasteful number, since it uses less digits than its factorization.

215878203968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679060 (or 1679043 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 59.

The spelling of 215878203968 in words is "two hundred fifteen billion, eight hundred seventy-eight million, two hundred three thousand, nine hundred sixty-eight".