129780320 has 24 divisors (see below), whose sum is σ = 306606384. Its totient is φ = 51912064.

The previous prime is 129780281. The next prime is 129780337. The reversal of 129780320 is 23087921.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405404 + ... + 405723.

It is an arithmetic number, because the mean of its divisors is an integer number (12775266).

Almost surely, 2^129780320 is an apocalyptic number.

129780320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129780320 is an abundant number, since it is smaller than the sum of its proper divisors (176826064).

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

129780320 is an equidigital number, since it uses as much as digits as its factorization.

129780320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811142 (or 811134 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 129780320 is about 11392.1165724373. The cubic root of 129780320 is about 506.2941937744.

The spelling of 129780320 in words is "one hundred twenty-nine million, seven hundred eighty thousand, three hundred twenty".