129516780 has 48 divisors (see below), whose sum is σ = 367766784. Its totient is φ = 34050240.

The previous prime is 129516773. The next prime is 129516781. The reversal of 129516780 is 87615921.

It is not an unprimeable number, because it can be changed into a prime (129516781) 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, 10942 + ... + 19461.

It is an arithmetic number, because the mean of its divisors is an integer number (7661808).

Almost surely, 2^129516780 is an apocalyptic number.

129516780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129516780 is an abundant number, since it is smaller than the sum of its proper divisors (238250004).

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

129516780 is a wasteful number, since it uses less digits than its factorization.

129516780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30486 (or 30484 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 129516780 is about 11380.5439237323. The cubic root of 129516780 is about 505.9512573669.

The spelling of 129516780 in words is "one hundred twenty-nine million, five hundred sixteen thousand, seven hundred eighty".