215620164 has 48 divisors (see below), whose sum is σ = 574134400. Its totient is φ = 69929568.

The previous prime is 215620123. The next prime is 215620199. The reversal of 215620164 is 461026512.

215620164 is a `hidden beast` number, since 21 + 5 + 620 + 16 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 22984 + ... + 30975.

Almost surely, 2^215620164 is an apocalyptic number.

It is an amenable number.

215620164 is an abundant number, since it is smaller than the sum of its proper divisors (358514236).

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

215620164 is a wasteful number, since it uses less digits than its factorization.

215620164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54009 (or 54001 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 215620164 is about 14684.0104876018. The cubic root of 215620164 is about 599.6480936435.

Adding to 215620164 its reverse (461026512), we get a palindrome (676646676).

The spelling of 215620164 in words is "two hundred fifteen million, six hundred twenty thousand, one hundred sixty-four".