215564 has 6 divisors (see below), whose sum is σ = 377244. Its totient is φ = 107780.

The previous prime is 215563. The next prime is 215573. The reversal of 215564 is 465512.

It is not an unprimeable number, because it can be changed into a prime (215563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26942 + ... + 26949.

It is an arithmetic number, because the mean of its divisors is an integer number (62874).

2²¹⁵⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

215564 is a deficient number, since it is larger than the sum of its proper divisors (161680).

215564 is a wasteful number, since it uses less digits than its factorization.

215564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53895 (or 53893 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 215564 is about 464.2887032871. The cubic root of 215564 is about 59.9596024363.

The spelling of 215564 in words is "two hundred fifteen thousand, five hundred sixty-four".