128879431 has 8 divisors (see below), whose sum is σ = 140863104. Its totient is φ = 117384960.

The previous prime is 128879407. The next prime is 128879447. The reversal of 128879431 is 134978821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128879431 is a prime.

It is a super-2 number, since 2×128879431² = 33219815469767522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128879461) 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, 121750 + ... + 122803.

It is an arithmetic number, because the mean of its divisors is an integer number (17607888).

Almost surely, 2^128879431 is an apocalyptic number.

128879431 is a deficient number, since it is larger than the sum of its proper divisors (11983673).

128879431 is a wasteful number, since it uses less digits than its factorization.

128879431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244601.

The product of its digits is 96768, while the sum is 43.

The square root of 128879431 is about 11352.5076965400. The cubic root of 128879431 is about 505.1199675771.

The spelling of 128879431 in words is "one hundred twenty-eight million, eight hundred seventy-nine thousand, four hundred thirty-one".