684240920 has 64 divisors (see below), whose sum is σ = 1767916800. Its totient is φ = 235716480.

The previous prime is 684240913. The next prime is 684240937. The reversal of 684240920 is 29042486.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32564 + ... + 49283.

It is an arithmetic number, because the mean of its divisors is an integer number (27623700).

Almost surely, 2^684240920 is an apocalyptic number.

It is an amenable number.

684240920 is an abundant number, since it is smaller than the sum of its proper divisors (1083675880).

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

684240920 is a wasteful number, since it uses less digits than its factorization.

684240920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81888 (or 81884 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 684240920 is about 26157.9991589571. Note that the first 3 decimals coincide. The cubic root of 684240920 is about 881.1902454663.

The spelling of 684240920 in words is "six hundred eighty-four million, two hundred forty thousand, nine hundred twenty".