129621630 has 16 divisors (see below), whose sum is σ = 311091984. Its totient is φ = 34565760.

The previous prime is 129621599. The next prime is 129621659. The reversal of 129621630 is 36126921.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 4320721 = 129621630 / (1 + 2 + 9 + 6 + 2 + 1 + 6 + 3 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2160331 + ... + 2160390.

It is an arithmetic number, because the mean of its divisors is an integer number (19443249).

Almost surely, 2^129621630 is an apocalyptic number.

129621630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129621630 is an abundant number, since it is smaller than the sum of its proper divisors (181470354).

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

129621630 is a wasteful number, since it uses less digits than its factorization.

129621630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4320731.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 129621630 is about 11385.1495378849. The cubic root of 129621630 is about 506.0877510849.

The spelling of 129621630 in words is "one hundred twenty-nine million, six hundred twenty-one thousand, six hundred thirty".