129915072 has 126 divisors (see below), whose sum is σ = 433268628. Its totient is φ = 37110528.

The previous prime is 129915067. The next prime is 129915091. The reversal of 129915072 is 270519921.

It is a tau number, because it is divible by the number of its divisors (126).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 25923 + ... + 30525.

Almost surely, 2^129915072 is an apocalyptic number.

129915072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129915072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216634314).

129915072 is an abundant number, since it is smaller than the sum of its proper divisors (303353556).

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

129915072 is a wasteful number, since it uses less digits than its factorization.

129915072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4635 (or 4615 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 129915072 is about 11398.0293033489. The cubic root of 129915072 is about 506.4693630046.

The spelling of 129915072 in words is "one hundred twenty-nine million, nine hundred fifteen thousand, seventy-two".