215646164 has 12 divisors (see below), whose sum is σ = 377942964. Its totient is φ = 107662464.

The previous prime is 215646131. The next prime is 215646187. The reversal of 215646164 is 461646512.

It can be written as a sum of positive squares in 2 ways, for example, as 165122500 + 50523664 = 12850^2 + 7108^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37109 + ... + 42524.

It is an arithmetic number, because the mean of its divisors is an integer number (31495247).

Almost surely, 2^215646164 is an apocalyptic number.

It is an amenable number.

215646164 is a deficient number, since it is larger than the sum of its proper divisors (162296800).

215646164 is a wasteful number, since it uses less digits than its factorization.

215646164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80314 (or 80312 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 215646164 is about 14684.8957776349. The cubic root of 215646164 is about 599.6721950132.

The spelling of 215646164 in words is "two hundred fifteen million, six hundred forty-six thousand, one hundred sixty-four".