129723664 has 20 divisors (see below), whose sum is σ = 287245504. Its totient is φ = 55595808.

The previous prime is 129723653. The next prime is 129723677. The reversal of 129723664 is 466327921.

It is a happy number.

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, 579012 + ... + 579235.

Almost surely, 2^129723664 is an apocalyptic number.

129723664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

129723664 is an abundant number, since it is smaller than the sum of its proper divisors (157521840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129723664 is a wasteful number, since it uses less digits than its factorization.

129723664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158262 (or 1158256 counting only the distinct ones).

The product of its digits is 108864, while the sum is 40.

The square root of 129723664 is about 11389.6296691332. The cubic root of 129723664 is about 506.2205082855.

The spelling of 129723664 in words is "one hundred twenty-nine million, seven hundred twenty-three thousand, six hundred sixty-four".