686682040 has 64 divisors (see below), whose sum is σ = 1774224000. Its totient is φ = 236557440.

The previous prime is 686681993. The next prime is 686682077. The reversal of 686682040 is 40286686.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 686681984 and 686682002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32710 + ... + 49429.

It is an arithmetic number, because the mean of its divisors is an integer number (27722250).

Almost surely, 2^686682040 is an apocalyptic number.

It is an amenable number.

686682040 is an abundant number, since it is smaller than the sum of its proper divisors (1087541960).

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

686682040 is a wasteful number, since it uses less digits than its factorization.

686682040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82180 (or 82176 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 686682040 is about 26204.6186768669. The cubic root of 686682040 is about 882.2369226559.

The spelling of 686682040 in words is "six hundred eighty-six million, six hundred eighty-two thousand, forty".