685977372 has 18 divisors (see below), whose sum is σ = 1733998448. Its totient is φ = 228659112.

The previous prime is 685977343. The next prime is 685977389. The reversal of 685977372 is 273779586.

685977372 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×685977372³ (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, 9527428 + ... + 9527499.

Almost surely, 2^685977372 is an apocalyptic number.

It is an amenable number.

685977372 is an abundant number, since it is smaller than the sum of its proper divisors (1048021076).

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

685977372 is a wasteful number, since it uses less digits than its factorization.

685977372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19054937 (or 19054932 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 54.

The square root of 685977372 is about 26191.1697333281. The cubic root of 685977372 is about 881.9350377131.

The spelling of 685977372 in words is "six hundred eighty-five million, nine hundred seventy-seven thousand, three hundred seventy-two".