684979140 has 24 divisors (see below), whose sum is σ = 1917941760. Its totient is φ = 182661088.

The previous prime is 684979093. The next prime is 684979157. The reversal of 684979140 is 41979486.

It is a self number, because there is not a number n which added to its sum of digits gives 684979140.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5708100 + ... + 5708219.

It is an arithmetic number, because the mean of its divisors is an integer number (79914240).

Almost surely, 2^684979140 is an apocalyptic number.

684979140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

684979140 is an abundant number, since it is smaller than the sum of its proper divisors (1232962620).

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

684979140 is a wasteful number, since it uses less digits than its factorization.

684979140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11416331 (or 11416329 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 684979140 is about 26172.1061437554. The cubic root of 684979140 is about 881.5070337206.

The spelling of 684979140 in words is "six hundred eighty-four million, nine hundred seventy-nine thousand, one hundred forty".