128772401 has 8 divisors (see below), whose sum is σ = 131925024. Its totient is φ = 125627040.

The previous prime is 128772373. The next prime is 128772437. The reversal of 128772401 is 104277821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128772401 - 2⁶ = 128772337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128772461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55670 + ... + 57936.

It is an arithmetic number, because the mean of its divisors is an integer number (16490628).

Almost surely, 2^128772401 is an apocalyptic number.

It is an amenable number.

128772401 is a deficient number, since it is larger than the sum of its proper divisors (3152623).

128772401 is a wasteful number, since it uses less digits than its factorization.

128772401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3631.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 128772401 is about 11347.7927809773. The cubic root of 128772401 is about 504.9801005131.

The spelling of 128772401 in words is "one hundred twenty-eight million, seven hundred seventy-two thousand, four hundred one".