129457680 has 80 divisors (see below), whose sum is σ = 437811264. Its totient is φ = 31383040.

The previous prime is 129457661. The next prime is 129457721. The reversal of 129457680 is 86754921.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21879 + ... + 27158.

Almost surely, 2^129457680 is an apocalyptic number.

129457680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129457680 is an abundant number, since it is smaller than the sum of its proper divisors (308353584).

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

129457680 is a wasteful number, since it uses less digits than its factorization.

129457680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49064 (or 49058 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 129457680 is about 11377.9470907541. The cubic root of 129457680 is about 505.8742885277.

The spelling of 129457680 in words is "one hundred twenty-nine million, four hundred fifty-seven thousand, six hundred eighty".