129072600 has 72 divisors (see below), whose sum is σ = 433474860. Its totient is φ = 34418880.

The previous prime is 129072583. The next prime is 129072637. The reversal of 129072600 is 6270921.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 34054 + ... + 37653.

Almost surely, 2^129072600 is an apocalyptic number.

129072600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129072600 is an abundant number, since it is smaller than the sum of its proper divisors (304402260).

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

129072600 is a wasteful number, since it uses less digits than its factorization.

129072600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71729 (or 71717 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 129072600 is about 11361.0122788421. The cubic root of 129072600 is about 505.3722054244.

The spelling of 129072600 in words is "one hundred twenty-nine million, seventy-two thousand, six hundred".