128884831 has 4 divisors (see below), whose sum is σ = 129812200. Its totient is φ = 127957464.

The previous prime is 128884829. The next prime is 128884843. The reversal of 128884831 is 138488821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138488821 = 3739 ⋅37039.

It is a cyclic number.

It is not a de Polignac number, because 128884831 - 2¹ = 128884829 is a prime.

It is a super-2 number, since 2×128884831² = 33222599323797122, 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 (128884891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463476 + ... + 463753.

It is an arithmetic number, because the mean of its divisors is an integer number (32453050).

Almost surely, 2^128884831 is an apocalyptic number.

128884831 is a deficient number, since it is larger than the sum of its proper divisors (927369).

128884831 is an equidigital number, since it uses as much as digits as its factorization.

128884831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927368.

The product of its digits is 98304, while the sum is 43.

The square root of 128884831 is about 11352.7455269640. The cubic root of 128884831 is about 505.1270222579.

The spelling of 128884831 in words is "one hundred twenty-eight million, eight hundred eighty-four thousand, eight hundred thirty-one".