129776420 has 24 divisors (see below), whose sum is σ = 272745144. Its totient is φ = 51869696.

The previous prime is 129776417. The next prime is 129776473. The reversal of 129776420 is 24677921.

It can be written as a sum of positive squares in 4 ways, for example, as 20448484 + 109327936 = 4522^2 + 10456^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45764 + ... + 48516.

It is an arithmetic number, because the mean of its divisors is an integer number (11364381).

Almost surely, 2^129776420 is an apocalyptic number.

129776420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129776420 is an abundant number, since it is smaller than the sum of its proper divisors (142968724).

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

129776420 is a wasteful number, since it uses less digits than its factorization.

129776420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5119 (or 5117 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 129776420 is about 11391.9454001501. The cubic root of 129776420 is about 506.2891222116.

The spelling of 129776420 in words is "one hundred twenty-nine million, seven hundred seventy-six thousand, four hundred twenty".