686651704 has 8 divisors (see below), whose sum is σ = 1287471960. Its totient is φ = 343325848.

The previous prime is 686651701. The next prime is 686651731. The reversal of 686651704 is 407156686.

It is a happy number.

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

It is a super-2 number, since 2×686651704² = 942981125212207232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686651701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42915724 + ... + 42915739.

It is an arithmetic number, because the mean of its divisors is an integer number (160933995).

Almost surely, 2^686651704 is an apocalyptic number.

It is an amenable number.

686651704 is a deficient number, since it is larger than the sum of its proper divisors (600820256).

686651704 is a wasteful number, since it uses less digits than its factorization.

686651704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85831469 (or 85831465 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 686651704 is about 26204.0398412153. The cubic root of 686651704 is about 882.2239307461.

The spelling of 686651704 in words is "six hundred eighty-six million, six hundred fifty-one thousand, seven hundred four".