215732928456 has 48 divisors (see below), whose sum is σ = 600067950300. Its totient is φ = 69967435392.

The previous prime is 215732928401. The next prime is 215732928461. The reversal of 215732928456 is 654829237512.

215732928456 is a `hidden beast` number, since 2 + 1 + 573 + 2 + 9 + 28 + 45 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 215639496900 + 93431556 = 464370^2 + 9666^2 .

It is a super-3 number, since 3×215732928456³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 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, 40487751 + ... + 40493078.

Almost surely, 2^215732928456 is an apocalyptic number.

It is an amenable number.

215732928456 is an abundant number, since it is smaller than the sum of its proper divisors (384335021844).

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

215732928456 is a wasteful number, since it uses less digits than its factorization.

215732928456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80980878 (or 80980871 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The spelling of 215732928456 in words is "two hundred fifteen billion, seven hundred thirty-two million, nine hundred twenty-eight thousand, four hundred fifty-six".