215244664 has 16 divisors (see below), whose sum is σ = 408693600. Its totient is φ = 106259712.

The previous prime is 215244643. The next prime is 215244671. The reversal of 215244664 is 466442512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169657 + ... + 170920.

It is an arithmetic number, because the mean of its divisors is an integer number (25543350).

Almost surely, 2^215244664 is an apocalyptic number.

It is an amenable number.

215244664 is a deficient number, since it is larger than the sum of its proper divisors (193448936).

215244664 is a wasteful number, since it uses less digits than its factorization.

215244664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340662 (or 340658 counting only the distinct ones).

The product of its digits is 46080, while the sum is 34.

The square root of 215244664 is about 14671.2188996007. The cubic root of 215244664 is about 599.2997979946.

The spelling of 215244664 in words is "two hundred fifteen million, two hundred forty-four thousand, six hundred sixty-four".