686980624 has 20 divisors (see below), whose sum is σ = 1452027600. Its totient is φ = 312263840.

The previous prime is 686980621. The next prime is 686980649. The reversal of 686980624 is 426089686.

It is a super-4 number, since 4×686980624⁴ (a number of 36 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (686980621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1951474 + ... + 1951825.

It is an arithmetic number, because the mean of its divisors is an integer number (72601380).

Almost surely, 2^686980624 is an apocalyptic number.

It is an amenable number.

686980624 is an abundant number, since it is smaller than the sum of its proper divisors (765046976).

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

686980624 is a wasteful number, since it uses less digits than its factorization.

686980624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3903318 (or 3903312 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 49.

The square root of 686980624 is about 26210.3152213017. The cubic root of 686980624 is about 882.3647759382.

The spelling of 686980624 in words is "six hundred eighty-six million, nine hundred eighty thousand, six hundred twenty-four".