685624093920 has 96 divisors (see below), whose sum is σ = 2399684343840. Its totient is φ = 182833090560.

The previous prime is 685624093919. The next prime is 685624093961. The reversal of 685624093920 is 29390426586.

It is a happy number.

685624093920 is a `hidden beast` number, since 6 + 8 + 5 + 6 + 240 + 9 + 392 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79350321 + ... + 79358960.

It is an arithmetic number, because the mean of its divisors is an integer number (24996711915).

Almost surely, 2^685624093920 is an apocalyptic number.

685624093920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

685624093920 is an abundant number, since it is smaller than the sum of its proper divisors (1714060249920).

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

685624093920 is a wasteful number, since it uses less digits than its factorization.

685624093920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158709305 (or 158709291 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 685624093920 in words is "six hundred eighty-five billion, six hundred twenty-four million, ninety-three thousand, nine hundred twenty".