218057512 has 8 divisors (see below), whose sum is σ = 408857850. Its totient is φ = 109028752.

The previous prime is 218057479. The next prime is 218057513. The reversal of 218057512 is 215750812.

It can be written as a sum of positive squares in only one way, i.e., 217680516 + 376996 = 14754^2 + 614^2 .

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

It is not an unprimeable number, because it can be changed into a prime (218057513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13628587 + ... + 13628602.

Almost surely, 2^218057512 is an apocalyptic number.

It is an amenable number.

218057512 is a deficient number, since it is larger than the sum of its proper divisors (190800338).

218057512 is a wasteful number, since it uses less digits than its factorization.

218057512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27257195 (or 27257191 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 218057512 is about 14766.7705338710. The cubic root of 218057512 is about 601.8990864795.

The spelling of 218057512 in words is "two hundred eighteen million, fifty-seven thousand, five hundred twelve".