129720448 has 128 divisors (see below), whose sum is σ = 320443200. Its totient is φ = 51425280.

The previous prime is 129720431. The next prime is 129720457. The reversal of 129720448 is 844027921.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347590 + ... + 347962.

Almost surely, 2^129720448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129720448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160221600).

129720448 is an abundant number, since it is smaller than the sum of its proper divisors (190722752).

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

129720448 is a wasteful number, since it uses less digits than its factorization.

129720448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 129720448 is about 11389.4884871973. The cubic root of 129720448 is about 506.2163249866.

The spelling of 129720448 in words is "one hundred twenty-nine million, seven hundred twenty thousand, four hundred forty-eight".