686974985 has 16 divisors (see below), whose sum is σ = 840428352. Its totient is φ = 538929600.

The previous prime is 686974969. The next prime is 686974987. The reversal of 686974985 is 589479686.

It is not a de Polignac number, because 686974985 - 2⁴ = 686974969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686974987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102590 + ... + 109080.

It is an arithmetic number, because the mean of its divisors is an integer number (52526772).

Almost surely, 2^686974985 is an apocalyptic number.

It is an amenable number.

686974985 is a deficient number, since it is larger than the sum of its proper divisors (153453367).

686974985 is a wasteful number, since it uses less digits than its factorization.

686974985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6904.

The product of its digits is 26127360, while the sum is 62.

The square root of 686974985 is about 26210.2076489295. The cubic root of 686974985 is about 882.3623616689.

The spelling of 686974985 in words is "six hundred eighty-six million, nine hundred seventy-four thousand, nine hundred eighty-five".