129687580 has 48 divisors (see below), whose sum is σ = 298295424. Its totient is φ = 46969920.

The previous prime is 129687557. The next prime is 129687581. The reversal of 129687580 is 85786921.

It is a self number, because there is not a number n which added to its sum of digits gives 129687580.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129687581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61219 + ... + 63301.

It is an arithmetic number, because the mean of its divisors is an integer number (6214488).

Almost surely, 2^129687580 is an apocalyptic number.

129687580 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 129687580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149147712).

129687580 is an abundant number, since it is smaller than the sum of its proper divisors (168607844).

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

129687580 is a wasteful number, since it uses less digits than its factorization.

129687580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386 (or 2384 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 129687580 is about 11388.0454863862. The cubic root of 129687580 is about 506.1735670820.

The spelling of 129687580 in words is "one hundred twenty-nine million, six hundred eighty-seven thousand, five hundred eighty".