685947980 has 24 divisors (see below), whose sum is σ = 1442425488. Its totient is φ = 274010688.

The previous prime is 685947973. The next prime is 685948007. The reversal of 685947980 is 89749586.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7514 + ... + 37793.

It is an arithmetic number, because the mean of its divisors is an integer number (60101062).

Almost surely, 2^685947980 is an apocalyptic number.

It is an amenable number.

685947980 is an abundant number, since it is smaller than the sum of its proper divisors (756477508).

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

685947980 is a wasteful number, since it uses less digits than its factorization.

685947980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46073 (or 46071 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 56.

The square root of 685947980 is about 26190.6086221760. The cubic root of 685947980 is about 881.9224414741.

The spelling of 685947980 in words is "six hundred eighty-five million, nine hundred forty-seven thousand, nine hundred eighty".