215555628 has 12 divisors (see below), whose sum is σ = 502963160. Its totient is φ = 71851872.

The previous prime is 215555621. The next prime is 215555633. The reversal of 215555628 is 826555512.

215555628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (215555621) 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, 8981473 + ... + 8981496.

Almost surely, 2^215555628 is an apocalyptic number.

It is an amenable number.

215555628 is an abundant number, since it is smaller than the sum of its proper divisors (287407532).

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

215555628 is a wasteful number, since it uses less digits than its factorization.

215555628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17962976 (or 17962974 counting only the distinct ones).

The product of its digits is 120000, while the sum is 39.

The square root of 215555628 is about 14681.8128308462. The cubic root of 215555628 is about 599.5882619621.

The spelling of 215555628 in words is "two hundred fifteen million, five hundred fifty-five thousand, six hundred twenty-eight".