215628988 has 24 divisors (see below), whose sum is σ = 384187104. Its totient is φ = 105873600.

The previous prime is 215628983. The next prime is 215628989. The reversal of 215628988 is 889826512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215628983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77298 + ... + 80038.

It is an arithmetic number, because the mean of its divisors is an integer number (16007796).

Almost surely, 2^215628988 is an apocalyptic number.

It is an amenable number.

215628988 is a deficient number, since it is larger than the sum of its proper divisors (168558116).

215628988 is a wasteful number, since it uses less digits than its factorization.

215628988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3093 (or 3091 counting only the distinct ones).

The product of its digits is 552960, while the sum is 49.

The square root of 215628988 is about 14684.3109474023. The cubic root of 215628988 is about 599.6562734948.

The spelling of 215628988 in words is "two hundred fifteen million, six hundred twenty-eight thousand, nine hundred eighty-eight".