686682064 has 10 divisors (see below), whose sum is σ = 1330446530. Its totient is φ = 343341024.

The previous prime is 686681993. The next prime is 686682077. The reversal of 686682064 is 460286686.

It can be written as a sum of positive squares in only one way, i.e., 686440000 + 242064 = 26200^2 + 492^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21458799 + ... + 21458830.

It is an arithmetic number, because the mean of its divisors is an integer number (133044653).

Almost surely, 2^686682064 is an apocalyptic number.

It is an amenable number.

686682064 is a deficient number, since it is larger than the sum of its proper divisors (643764466).

686682064 is a wasteful number, since it uses less digits than its factorization.

686682064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42917637 (or 42917631 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 46.

The square root of 686682064 is about 26204.6191348014. The cubic root of 686682064 is about 882.2369329342.

The spelling of 686682064 in words is "six hundred eighty-six million, six hundred eighty-two thousand, sixty-four".