129885720 has 32 divisors (see below), whose sum is σ = 389657520. Its totient is φ = 34636160.

The previous prime is 129885713. The next prime is 129885773. The reversal of 129885720 is 27588921.

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, 541071 + ... + 541310.

Almost surely, 2^129885720 is an apocalyptic number.

129885720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129885720 is an abundant number, since it is smaller than the sum of its proper divisors (259771800).

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

129885720 is a wasteful number, since it uses less digits than its factorization.

129885720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082395 (or 1082391 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 129885720 is about 11396.7416396091. The cubic root of 129885720 is about 506.4312175500.

The spelling of 129885720 in words is "one hundred twenty-nine million, eight hundred eighty-five thousand, seven hundred twenty".