216057990 has 32 divisors (see below), whose sum is σ = 518939136. Its totient is φ = 57571040.

The previous prime is 216057979. The next prime is 216058009. The reversal of 216057990 is 99750612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60145 + ... + 63635.

It is an arithmetic number, because the mean of its divisors is an integer number (16216848).

Almost surely, 2^216057990 is an apocalyptic number.

216057990 is an abundant number, since it is smaller than the sum of its proper divisors (302881146).

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

216057990 is a wasteful number, since it uses less digits than its factorization.

216057990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5564.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 216057990 is about 14698.9111841660. The cubic root of 216057990 is about 600.0536896400.

The spelling of 216057990 in words is "two hundred sixteen million, fifty-seven thousand, nine hundred ninety".