684507400020 has 54 divisors (see below), whose sum is σ = 2076372784122. Its totient is φ = 182532346656.

The previous prime is 684507399911. The next prime is 684507400097. The reversal of 684507400020 is 20004705486.

It can be written as a sum of positive squares in only one way, i.e., 547605920016 + 136901480004 = 740004^2 + 370002^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11069227 + ... + 11130893.

Almost surely, 2^684507400020 is an apocalyptic number.

684507400020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

684507400020 is an abundant number, since it is smaller than the sum of its proper divisors (1391865384102).

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

684507400020 is an frugal number, since it uses more digits than its factorization.

684507400020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123349 (or 61677 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The spelling of 684507400020 in words is "six hundred eighty-four billion, five hundred seven million, four hundred thousand, twenty".