129730128008 has 16 divisors (see below), whose sum is σ = 261955066380. Its totient is φ = 59875443648.

The previous prime is 129730127999. The next prime is 129730128029. The reversal of 129730128008 is 800821037921.

It can be written as a sum of positive squares in 2 ways, for example, as 129212929444 + 517198564 = 359462^2 + 22742^2 .

It is a super-2 number, since 2×129730128008² (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 3 ways as a sum of consecutive naturals, for example, 623702435 + ... + 623702642.

Almost surely, 2^129730128008 is an apocalyptic number.

It is an amenable number.

129730128008 is an abundant number, since it is smaller than the sum of its proper divisors (132224938372).

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

129730128008 is a wasteful number, since it uses less digits than its factorization.

129730128008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247405096 (or 1247405092 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The spelling of 129730128008 in words is "one hundred twenty-nine billion, seven hundred thirty million, one hundred twenty-eight thousand, eight".