129077744420 has 96 divisors (see below), whose sum is σ = 283498185600. Its totient is φ = 49330371584.

The previous prime is 129077744399. The next prime is 129077744447. The reversal of 129077744420 is 24447770921.

It is a super-2 number, since 2×129077744420² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6682136 + ... + 6701424.

It is an arithmetic number, because the mean of its divisors is an integer number (2953106100).

Almost surely, 2^129077744420 is an apocalyptic number.

129077744420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129077744420 is an abundant number, since it is smaller than the sum of its proper divisors (154420441180).

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

129077744420 is a wasteful number, since it uses less digits than its factorization.

129077744420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19517 (or 19515 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 47.

The spelling of 129077744420 in words is "one hundred twenty-nine billion, seventy-seven million, seven hundred forty-four thousand, four hundred twenty".