215642530 has 16 divisors (see below), whose sum is σ = 389784960. Its totient is φ = 85895152.

The previous prime is 215642527. The next prime is 215642599. The reversal of 215642530 is 35246512.

215642530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42724 + ... + 47503.

It is an arithmetic number, because the mean of its divisors is an integer number (24361560).

Almost surely, 2^215642530 is an apocalyptic number.

215642530 is a deficient number, since it is larger than the sum of its proper divisors (174142430).

215642530 is a wasteful number, since it uses less digits than its factorization.

215642530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90473.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 215642530 is about 14684.7720445365. The cubic root of 215642530 is about 599.6688264997.

The spelling of 215642530 in words is "two hundred fifteen million, six hundred forty-two thousand, five hundred thirty".