129779280 has 80 divisors (see below), whose sum is σ = 447024960. Its totient is φ = 34607232.

The previous prime is 129779261. The next prime is 129779281. The reversal of 129779280 is 82977921.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129779281) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 27882 + ... + 32201.

It is an arithmetic number, because the mean of its divisors is an integer number (5587812).

Almost surely, 2^129779280 is an apocalyptic number.

129779280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129779280 is an abundant number, since it is smaller than the sum of its proper divisors (317245680).

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

129779280 is a wasteful number, since it uses less digits than its factorization.

129779280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60105 (or 60093 counting only the distinct ones).

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

The square root of 129779280 is about 11392.0709267455. The cubic root of 129779280 is about 506.2928413676.

The spelling of 129779280 in words is "one hundred twenty-nine million, seven hundred seventy-nine thousand, two hundred eighty".