657131740 has 12 divisors (see below), whose sum is σ = 1379976696. Its totient is φ = 262852688.

The previous prime is 657131737. The next prime is 657131747. The reversal of 657131740 is 47131756.

It is a junction number, because it is equal to n+sod(n) for n = 657131696 and 657131705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657131747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16428274 + ... + 16428313.

It is an arithmetic number, because the mean of its divisors is an integer number (114998058).

Almost surely, 2^657131740 is an apocalyptic number.

It is an amenable number.

657131740 is an abundant number, since it is smaller than the sum of its proper divisors (722844956).

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

657131740 is a wasteful number, since it uses less digits than its factorization.

657131740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32856596 (or 32856594 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 657131740 is about 25634.5809405966. The cubic root of 657131740 is about 869.3956872615.

The spelling of 657131740 in words is "six hundred fifty-seven million, one hundred thirty-one thousand, seven hundred forty".