129687500 has 54 divisors (see below), whose sum is σ = 287109228. Its totient is φ = 51250000.

The previous prime is 129687499. The next prime is 129687529. The reversal of 129687500 is 5786921.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1562459 + ... + 1562541.

Almost surely, 2^129687500 is an apocalyptic number.

129687500 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 129687500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143554614).

129687500 is an abundant number, since it is smaller than the sum of its proper divisors (157421728).

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

129687500 is an frugal number, since it uses more digits than its factorization.

129687500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 129687500 is about 11388.0419739304. The cubic root of 129687500 is about 506.1734630014.

The spelling of 129687500 in words is "one hundred twenty-nine million, six hundred eighty-seven thousand, five hundred".