686660625 has 80 divisors (see below), whose sum is σ = 1453034880. Its totient is φ = 313848000.

The previous prime is 686660609. The next prime is 686660657. The reversal of 686660625 is 526066686.

686660625 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 686660625 - 2⁴ = 686660609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 115219 + ... + 121031.

It is an arithmetic number, because the mean of its divisors is an integer number (18162936).

Almost surely, 2^686660625 is an apocalyptic number.

It is an amenable number.

686660625 is an abundant number, since it is smaller than the sum of its proper divisors (766374255).

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

686660625 is an equidigital number, since it uses as much as digits as its factorization.

686660625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5849 (or 5828 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 686660625 is about 26204.2100625071. The cubic root of 686660625 is about 882.2277513563.

The spelling of 686660625 in words is "six hundred eighty-six million, six hundred sixty thousand, six hundred twenty-five".