686694088 has 8 divisors (see below), whose sum is σ = 1287551430. Its totient is φ = 343347040.

The previous prime is 686694059. The next prime is 686694139. The reversal of 686694088 is 880496686.

It is a happy number.

686694088 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 496309284 + 190384804 = 22278^2 + 13798^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42918373 + ... + 42918388.

Almost surely, 2^686694088 is an apocalyptic number.

It is an amenable number.

686694088 is a deficient number, since it is larger than the sum of its proper divisors (600857342).

686694088 is a wasteful number, since it uses less digits than its factorization.

686694088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85836767 (or 85836763 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 55.

The square root of 686694088 is about 26204.8485589976. The cubic root of 686694088 is about 882.2420823114.

The spelling of 686694088 in words is "six hundred eighty-six million, six hundred ninety-four thousand, eighty-eight".