215563530 has 96 divisors (see below), whose sum is σ = 639015552. Its totient is φ = 45319680.

The previous prime is 215563529. The next prime is 215563541. The reversal of 215563530 is 35365512.

215563530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 766990 + ... + 767270.

It is an arithmetic number, because the mean of its divisors is an integer number (6656412).

Almost surely, 2^215563530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215563530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (319507776).

215563530 is an abundant number, since it is smaller than the sum of its proper divisors (423452022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215563530 is a wasteful number, since it uses less digits than its factorization.

215563530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 30.

The square root of 215563530 is about 14682.0819368372. The cubic root of 215563530 is about 599.5955885914.

The spelling of 215563530 in words is "two hundred fifteen million, five hundred sixty-three thousand, five hundred thirty".