129685664 has 24 divisors (see below), whose sum is σ = 256542048. Its totient is φ = 64532160.

The previous prime is 129685657. The next prime is 129685723. The reversal of 129685664 is 466586921.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2852 + ... + 16355.

It is an arithmetic number, because the mean of its divisors is an integer number (10689252).

Almost surely, 2^129685664 is an apocalyptic number.

It is an amenable number.

129685664 is a deficient number, since it is larger than the sum of its proper divisors (126856384).

129685664 is a wasteful number, since it uses less digits than its factorization.

129685664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19428 (or 19420 counting only the distinct ones).

The product of its digits is 622080, while the sum is 47.

The square root of 129685664 is about 11387.9613627725. The cubic root of 129685664 is about 506.1710743392.

The spelling of 129685664 in words is "one hundred twenty-nine million, six hundred eighty-five thousand, six hundred sixty-four".