129977280 has 84 divisors (see below), whose sum is σ = 447077592. Its totient is φ = 34659840.

The previous prime is 129977273. The next prime is 129977297. The reversal of 129977280 is 82779921.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19686 + ... + 25445.

Almost surely, 2^129977280 is an apocalyptic number.

129977280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129977280 is an abundant number, since it is smaller than the sum of its proper divisors (317100312).

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

129977280 is a wasteful number, since it uses less digits than its factorization.

129977280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45154 (or 45141 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 129977280 is about 11400.7578695453. The cubic root of 129977280 is about 506.5501886757.

The spelling of 129977280 in words is "one hundred twenty-nine million, nine hundred seventy-seven thousand, two hundred eighty".