215520164 has 6 divisors (see below), whose sum is σ = 377160294. Its totient is φ = 107760080.

The previous prime is 215520161. The next prime is 215520181. The reversal of 215520164 is 461025512.

It can be written as a sum of positive squares in only one way, i.e., 190219264 + 25300900 = 13792^2 + 5030^2 .

It is not an unprimeable number, because it can be changed into a prime (215520161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26940017 + ... + 26940024.

It is an arithmetic number, because the mean of its divisors is an integer number (62860049).

Almost surely, 2^215520164 is an apocalyptic number.

It is an amenable number.

215520164 is a deficient number, since it is larger than the sum of its proper divisors (161640130).

215520164 is a wasteful number, since it uses less digits than its factorization.

215520164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53880045 (or 53880043 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 215520164 is about 14680.6050284040. The cubic root of 215520164 is about 599.5553780076. Note that the first 3 decimals are identical.

Adding to 215520164 its reverse (461025512), we get a palindrome (676545676).

The spelling of 215520164 in words is "two hundred fifteen million, five hundred twenty thousand, one hundred sixty-four".