129990528 has 128 divisors (see below), whose sum is σ = 397188000. Its totient is φ = 41803776.

The previous prime is 129990493. The next prime is 129990587. The reversal of 129990528 is 825099921.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99576 + ... + 100872.

Almost surely, 2^129990528 is an apocalyptic number.

129990528 is a gapful number since it is divisible by the number (18) 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 129990528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198594000).

129990528 is an abundant number, since it is smaller than the sum of its proper divisors (267197472).

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

129990528 is a wasteful number, since it uses less digits than its factorization.

129990528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349 (or 1331 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 129990528 is about 11401.3388687470. The cubic root of 129990528 is about 506.5673982191.

The spelling of 129990528 in words is "one hundred twenty-nine million, nine hundred ninety thousand, five hundred twenty-eight".