129747680 has 24 divisors (see below), whose sum is σ = 306529272. Its totient is φ = 51899008.

The previous prime is 129747649. The next prime is 129747701. The reversal of 129747680 is 86747921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405302 + ... + 405621.

It is an arithmetic number, because the mean of its divisors is an integer number (12772053).

Almost surely, 2^129747680 is an apocalyptic number.

129747680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129747680 is an abundant number, since it is smaller than the sum of its proper divisors (176781592).

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

129747680 is an equidigital number, since it uses as much as digits as its factorization.

129747680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810938 (or 810930 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 129747680 is about 11390.6839127420. The cubic root of 129747680 is about 506.2517455612.

The spelling of 129747680 in words is "one hundred twenty-nine million, seven hundred forty-seven thousand, six hundred eighty".