656754989 has 8 divisors (see below), whose sum is σ = 717035520. Its totient is φ = 596570400.

The previous prime is 656754977. The next prime is 656755009. The reversal of 656754989 is 989457656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 656754989 - 2⁸ = 656754733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656754919) 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, 9272 + ... + 37409.

It is an arithmetic number, because the mean of its divisors is an integer number (89629440).

Almost surely, 2^656754989 is an apocalyptic number.

It is an amenable number.

656754989 is a deficient number, since it is larger than the sum of its proper divisors (60280531).

656754989 is a wasteful number, since it uses less digits than its factorization.

656754989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47971.

The product of its digits is 16329600, while the sum is 59.

The square root of 656754989 is about 25627.2313955292. The cubic root of 656754989 is about 869.2295063212.

The spelling of 656754989 in words is "six hundred fifty-six million, seven hundred fifty-four thousand, nine hundred eighty-nine".