685247920 has 80 divisors (see below), whose sum is σ = 1916663040. Its totient is φ = 222573312.

The previous prime is 685247903. The next prime is 685248017. The reversal of 685247920 is 29742586.

It is a tau number, because it is divible by the number of its divisors (80).

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, 21562 + ... + 42841.

It is an arithmetic number, because the mean of its divisors is an integer number (23958288).

Almost surely, 2^685247920 is an apocalyptic number.

It is an amenable number.

685247920 is an abundant number, since it is smaller than the sum of its proper divisors (1231415120).

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

685247920 is a wasteful number, since it uses less digits than its factorization.

685247920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64442 (or 64436 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 685247920 is about 26177.2404962784. The cubic root of 685247920 is about 881.6223172689.

The spelling of 685247920 in words is "six hundred eighty-five million, two hundred forty-seven thousand, nine hundred twenty".