129868620 has 144 divisors (see below), whose sum is σ = 427166208. Its totient is φ = 29393280.

The previous prime is 129868589. The next prime is 129868633. The reversal of 129868620 is 26868921.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 479085 + ... + 479355.

It is an arithmetic number, because the mean of its divisors is an integer number (2966432).

Almost surely, 2^129868620 is an apocalyptic number.

129868620 is a gapful number since it is divisible by the number (10) 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 129868620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213583104).

129868620 is an abundant number, since it is smaller than the sum of its proper divisors (297297588).

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

129868620 is a wasteful number, since it uses less digits than its factorization.

129868620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 451 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 129868620 is about 11395.9914004882. The cubic root of 129868620 is about 506.4089919764.

The spelling of 129868620 in words is "one hundred twenty-nine million, eight hundred sixty-eight thousand, six hundred twenty".