129977664 has 28 divisors (see below), whose sum is σ = 343899744. Its totient is φ = 43325824.

The previous prime is 129977663. The next prime is 129977693. The reversal of 129977664 is 466779921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129977663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338292 + ... + 338675.

Almost surely, 2^129977664 is an apocalyptic number.

It is an amenable number.

129977664 is an abundant number, since it is smaller than the sum of its proper divisors (213922080).

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

129977664 is an equidigital number, since it uses as much as digits as its factorization.

129977664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676982 (or 676972 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 51.

The square root of 129977664 is about 11400.7747105186. The cubic root of 129977664 is about 506.5506875195.

The spelling of 129977664 in words is "one hundred twenty-nine million, nine hundred seventy-seven thousand, six hundred sixty-four".