685974928 has 10 divisors (see below), whose sum is σ = 1329076454. Its totient is φ = 342987456.

The previous prime is 685974911. The next prime is 685974937. The reversal of 685974928 is 829479586.

It can be written as a sum of positive squares in only one way, i.e., 649638144 + 36336784 = 25488^2 + 6028^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21436701 + ... + 21436732.

Almost surely, 2^685974928 is an apocalyptic number.

It is an amenable number.

685974928 is a deficient number, since it is larger than the sum of its proper divisors (643101526).

685974928 is a wasteful number, since it uses less digits than its factorization.

685974928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42873441 (or 42873435 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 58.

The square root of 685974928 is about 26191.1230763402. The cubic root of 685974928 is about 881.9339903259.

The spelling of 685974928 in words is "six hundred eighty-five million, nine hundred seventy-four thousand, nine hundred twenty-eight".