128257933 has 8 divisors (see below), whose sum is σ = 130877208. Its totient is φ = 125646144.

The previous prime is 128257931. The next prime is 128257939. The reversal of 128257933 is 339752821.

It can be written as a sum of positive squares in 4 ways, for example, as 522729 + 127735204 = 723^2 + 11302^2 .

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 128257933 - 2¹ = 128257931 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128257931) 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, 43791 + ... + 46627.

It is an arithmetic number, because the mean of its divisors is an integer number (16359651).

Almost surely, 2^128257933 is an apocalyptic number.

It is an amenable number.

128257933 is a deficient number, since it is larger than the sum of its proper divisors (2619275).

128257933 is an equidigital number, since it uses as much as digits as its factorization.

128257933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3743.

The product of its digits is 90720, while the sum is 40.

The square root of 128257933 is about 11325.1018979963. The cubic root of 128257933 is about 504.3067086811.

The spelling of 128257933 in words is "one hundred twenty-eight million, two hundred fifty-seven thousand, nine hundred thirty-three".