218012572 has 6 divisors (see below), whose sum is σ = 381522008. Its totient is φ = 109006284.

The previous prime is 218012569. The next prime is 218012579. The reversal of 218012572 is 275210812.

It is a self number, because there is not a number n which added to its sum of digits gives 218012572.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218012579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27251568 + ... + 27251575.

Almost surely, 2^218012572 is an apocalyptic number.

It is an amenable number.

218012572 is a deficient number, since it is larger than the sum of its proper divisors (163509436).

218012572 is a wasteful number, since it uses less digits than its factorization.

218012572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54503147 (or 54503145 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 218012572 is about 14765.2487957366. The cubic root of 218012572 is about 601.8577346925.

The spelling of 218012572 in words is "two hundred eighteen million, twelve thousand, five hundred seventy-two".