686701628 has 12 divisors (see below), whose sum is σ = 1204506240. Its totient is φ = 342556992.

The previous prime is 686701627. The next prime is 686701637. The reversal of 686701628 is 826107686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686701627) 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, 196508 + ... + 199971.

It is an arithmetic number, because the mean of its divisors is an integer number (100375520).

Almost surely, 2^686701628 is an apocalyptic number.

It is an amenable number.

686701628 is a deficient number, since it is larger than the sum of its proper divisors (517804612).

686701628 is a wasteful number, since it uses less digits than its factorization.

686701628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396916 (or 396914 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 686701628 is about 26204.9924251086. The cubic root of 686701628 is about 882.2453113480.

The spelling of 686701628 in words is "six hundred eighty-six million, seven hundred one thousand, six hundred twenty-eight".