657213912 has 56 divisors (see below), whose sum is σ = 1847585340. Its totient is φ = 219069360.

The previous prime is 657213899. The next prime is 657213913. The reversal of 657213912 is 219312756.

It is a super-3 number, since 3×657213912³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657213913) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 50514 + ... + 62177.

Almost surely, 2^657213912 is an apocalyptic number.

It is an amenable number.

657213912 is an abundant number, since it is smaller than the sum of its proper divisors (1190371428).

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

657213912 is a wasteful number, since it uses less digits than its factorization.

657213912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112715 (or 112696 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 657213912 is about 25636.1836473372. The cubic root of 657213912 is about 869.4319240364.

The spelling of 657213912 in words is "six hundred fifty-seven million, two hundred thirteen thousand, nine hundred twelve".