656891982 has 12 divisors (see below), whose sum is σ = 1423266000. Its totient is φ = 218963988.

The previous prime is 656891957. The next prime is 656892011. The reversal of 656891982 is 289198656.

It is a happy number.

It is a super-3 number, since 3×656891982³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18246982 + ... + 18247017.

It is an arithmetic number, because the mean of its divisors is an integer number (118605500).

Almost surely, 2^656891982 is an apocalyptic number.

656891982 is an abundant number, since it is smaller than the sum of its proper divisors (766374018).

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

656891982 is a wasteful number, since it uses less digits than its factorization.

656891982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36494007 (or 36494004 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 656891982 is about 25629.9040575653. The cubic root of 656891982 is about 869.2899398574.

The spelling of 656891982 in words is "six hundred fifty-six million, eight hundred ninety-one thousand, nine hundred eighty-two".