128972704 has 72 divisors (see below), whose sum is σ = 299230848. Its totient is φ = 54552960.

The previous prime is 128972689. The next prime is 128972717. The reversal of 128972704 is 407279821.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129649 + ... + 130639.

It is an arithmetic number, because the mean of its divisors is an integer number (4155984).

Almost surely, 2^128972704 is an apocalyptic number.

128972704 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128972704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149615424).

128972704 is an abundant number, since it is smaller than the sum of its proper divisors (170258144).

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

128972704 is an equidigital number, since it uses as much as digits as its factorization.

128972704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098 (or 1083 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 128972704 is about 11356.6149886311. The cubic root of 128972704 is about 505.2417938274.

The spelling of 128972704 in words is "one hundred twenty-eight million, nine hundred seventy-two thousand, seven hundred four".