215648564 has 6 divisors (see below), whose sum is σ = 377384994. Its totient is φ = 107824280.

The previous prime is 215648491. The next prime is 215648581. The reversal of 215648564 is 465846512.

It can be written as a sum of positive squares in only one way, i.e., 162358564 + 53290000 = 12742^2 + 7300^2 .

It is a congruent number.

It is an unprimeable number.

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, 26956067 + ... + 26956074.

It is an arithmetic number, because the mean of its divisors is an integer number (62897499).

Almost surely, 2^215648564 is an apocalyptic number.

It is an amenable number.

215648564 is a deficient number, since it is larger than the sum of its proper divisors (161736430).

215648564 is a wasteful number, since it uses less digits than its factorization.

215648564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53912145 (or 53912143 counting only the distinct ones).

The product of its digits is 230400, while the sum is 41.

The square root of 215648564 is about 14684.9774940243. The cubic root of 215648564 is about 599.6744196573.

The spelling of 215648564 in words is "two hundred fifteen million, six hundred forty-eight thousand, five hundred sixty-four".