685705235220 has 72 divisors (see below), whose sum is σ = 2080040062464. Its totient is φ = 182848794048.

The previous prime is 685705235209. The next prime is 685705235239. The reversal of 685705235220 is 22532507586.

685705235220 is a `hidden beast` number, since 6 + 8 + 5 + 70 + 52 + 3 + 522 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10444537 + ... + 10509983.

It is an arithmetic number, because the mean of its divisors is an integer number (28889445312).

Almost surely, 2^685705235220 is an apocalyptic number.

685705235220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

685705235220 is an abundant number, since it is smaller than the sum of its proper divisors (1394334827244).

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

685705235220 is a wasteful number, since it uses less digits than its factorization.

685705235220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123669 (or 123664 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 45.

The spelling of 685705235220 in words is "six hundred eighty-five billion, seven hundred five million, two hundred thirty-five thousand, two hundred twenty".