657140428 has 24 divisors (see below), whose sum is σ = 1339081632. Its totient is φ = 276317184.

The previous prime is 657140401. The next prime is 657140443. The reversal of 657140428 is 824041756.

657140428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×657140428² = 863667084224046368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219925 + ... + 222892.

It is an arithmetic number, because the mean of its divisors is an integer number (55795068).

Almost surely, 2^657140428 is an apocalyptic number.

It is an amenable number.

657140428 is an abundant number, since it is smaller than the sum of its proper divisors (681941204).

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

657140428 is a wasteful number, since it uses less digits than its factorization.

657140428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442881 (or 442879 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 657140428 is about 25634.7503986288. The cubic root of 657140428 is about 869.3995186984.

The spelling of 657140428 in words is "six hundred fifty-seven million, one hundred forty thousand, four hundred twenty-eight".