657228864 has 56 divisors (see below), whose sum is σ = 1814535360. Its totient is φ = 209549824.

The previous prime is 657228863. The next prime is 657228881. The reversal of 657228864 is 468822756.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (657228863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69999 + ... + 78830.

Almost surely, 2^657228864 is an apocalyptic number.

657228864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

657228864 is an abundant number, since it is smaller than the sum of its proper divisors (1157306496).

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

657228864 is a wasteful number, since it uses less digits than its factorization.

657228864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148867 (or 148857 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 48.

The square root of 657228864 is about 25636.4752647473. The cubic root of 657228864 is about 869.4385173476.

The spelling of 657228864 in words is "six hundred fifty-seven million, two hundred twenty-eight thousand, eight hundred sixty-four".