685706400720 has 240 divisors, whose sum is σ = 2605223380032. Its totient is φ = 166231802880.

The previous prime is 685706400713. The next prime is 685706400749. The reversal of 685706400720 is 27004607586.

685706400720 is a `hidden beast` number, since 6 + 8 + 570 + 6 + 4 + 0 + 0 + 72 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

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 47 ways as a sum of consecutive naturals, for example, 1389477 + ... + 1817156.

Almost surely, 2^685706400720 is an apocalyptic number.

685706400720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

685706400720 is an abundant number, since it is smaller than the sum of its proper divisors (1919516979312).

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

685706400720 is a wasteful number, since it uses less digits than its factorization.

685706400720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3206672 (or 3206654 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 685706400720 in words is "six hundred eighty-five billion, seven hundred six million, four hundred thousand, seven hundred twenty".