215563144 has 8 divisors (see below), whose sum is σ = 404180910. Its totient is φ = 107781568.

The previous prime is 215563133. The next prime is 215563157. The reversal of 215563144 is 441365512.

It is a happy number.

215563144 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 only one way, i.e., 127916100 + 87647044 = 11310^2 + 9362^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13472689 + ... + 13472704.

Almost surely, 2^215563144 is an apocalyptic number.

It is an amenable number.

215563144 is a deficient number, since it is larger than the sum of its proper divisors (188617766).

215563144 is a wasteful number, since it uses less digits than its factorization.

215563144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26945399 (or 26945395 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 215563144 is about 14682.0687915566. The cubic root of 215563144 is about 599.5952307015.

The spelling of 215563144 in words is "two hundred fifteen million, five hundred sixty-three thousand, one hundred forty-four".