215898164 has 12 divisors (see below), whose sum is σ = 400046724. Its totient is φ = 101599104.

The previous prime is 215898161. The next prime is 215898191. The reversal of 215898164 is 461898512.

215898164 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 195720100 + 20178064 = 13990^2 + 4492^2 .

It is a super-2 number, since 2×215898164² = 93224034437141792, which contains 22 as substring.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215898161) 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, 1587419 + ... + 1587554.

It is an arithmetic number, because the mean of its divisors is an integer number (33337227).

Almost surely, 2^215898164 is an apocalyptic number.

It is an amenable number.

215898164 is a deficient number, since it is larger than the sum of its proper divisors (184148560).

215898164 is a wasteful number, since it uses less digits than its factorization.

215898164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174994 (or 3174992 counting only the distinct ones).

The product of its digits is 138240, while the sum is 44.

The square root of 215898164 is about 14693.4735171776. The cubic root of 215898164 is about 599.9056925850.

The spelling of 215898164 in words is "two hundred fifteen million, eight hundred ninety-eight thousand, one hundred sixty-four".