129879864 has 96 divisors (see below), whose sum is σ = 385398000. Its totient is φ = 39330816.

The previous prime is 129879853. The next prime is 129879887. The reversal of 129879864 is 468978921.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 129879864.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33667 + ... + 37325.

Almost surely, 2^129879864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129879864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192699000).

129879864 is an abundant number, since it is smaller than the sum of its proper divisors (255518136).

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

129879864 is a wasteful number, since it uses less digits than its factorization.

129879864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3717 (or 3710 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 129879864 is about 11396.4847211761. The cubic root of 129879864 is about 506.4236064855.

The spelling of 129879864 in words is "one hundred twenty-nine million, eight hundred seventy-nine thousand, eight hundred sixty-four".