657140427 has 12 divisors (see below), whose sum is σ = 949433680. Its totient is φ = 437987088.

The previous prime is 657140401. The next prime is 657140443. The reversal of 657140427 is 724041756.

657140427 is a `hidden beast` number, since 6 + 571 + 40 + 42 + 7 = 666.

It is not a de Polignac number, because 657140427 - 2¹² = 657136331 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 657140391 and 657140400.

It is not an unprimeable number, because it can be changed into a prime (657140447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52578 + ... + 63864.

Almost surely, 2^657140427 is an apocalyptic number.

657140427 is a deficient number, since it is larger than the sum of its proper divisors (292293253).

657140427 is a wasteful number, since it uses less digits than its factorization.

657140427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17762 (or 17759 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 657140427 is about 25634.7503791240. The cubic root of 657140427 is about 869.3995182574.

The spelling of 657140427 in words is "six hundred fifty-seven million, one hundred forty thousand, four hundred twenty-seven".