657149712 has 20 divisors (see below), whose sum is σ = 1697636880. Its totient is φ = 219049888.

The previous prime is 657149653. The next prime is 657149741. The reversal of 657149712 is 217941756.

It is a happy 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, 6845262 + ... + 6845357.

It is an arithmetic number, because the mean of its divisors is an integer number (84881844).

Almost surely, 2^657149712 is an apocalyptic number.

It is an amenable number.

657149712 is an abundant number, since it is smaller than the sum of its proper divisors (1040487168).

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

657149712 is a wasteful number, since it uses less digits than its factorization.

657149712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13690630 (or 13690624 counting only the distinct ones).

The product of its digits is 105840, while the sum is 42.

The square root of 657149712 is about 25634.9314803063. The cubic root of 657149712 is about 869.4036129360.

The spelling of 657149712 in words is "six hundred fifty-seven million, one hundred forty-nine thousand, seven hundred twelve".