686557004 has 12 divisors (see below), whose sum is σ = 1373114064. Its totient is φ = 294238704.

The previous prime is 686556971. The next prime is 686557033. The reversal of 686557004 is 400755686.

686557004 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12259919 + ... + 12259974.

It is an arithmetic number, because the mean of its divisors is an integer number (114426172).

Almost surely, 2^686557004 is an apocalyptic number.

It is an amenable number.

686557004 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

686557004 is a wasteful number, since it uses less digits than its factorization.

686557004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24519904 (or 24519902 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 686557004 is about 26202.2328056217. The cubic root of 686557004 is about 882.1833713927.

The spelling of 686557004 in words is "six hundred eighty-six million, five hundred fifty-seven thousand, four".