215007765720 has 64 divisors (see below), whose sum is σ = 703661783040. Its totient is φ = 52123094400.

The previous prime is 215007765649. The next prime is 215007765733. The reversal of 215007765720 is 27567700512.

It is a congruent number.

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, 81441016 + ... + 81443655.

It is an arithmetic number, because the mean of its divisors is an integer number (10994715360).

Almost surely, 2^215007765720 is an apocalyptic number.

215007765720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215007765720 is an abundant number, since it is smaller than the sum of its proper divisors (488654017320).

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

215007765720 is a wasteful number, since it uses less digits than its factorization.

215007765720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162884696 (or 162884692 counting only the distinct ones).

The product of its (nonzero) digits is 205800, while the sum is 42.

The spelling of 215007765720 in words is "two hundred fifteen billion, seven million, seven hundred sixty-five thousand, seven hundred twenty".