128488431 has 32 divisors (see below), whose sum is σ = 193052160. Its totient is φ = 75534336.

The previous prime is 128488421. The next prime is 128488433. The reversal of 128488431 is 134884821.

It is a happy number.

It is not a de Polignac number, because 128488431 - 2¹⁹ = 127964143 is a prime.

It is a super-2 number, since 2×128488431² = 33018553801683522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128488431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128488433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93310 + ... + 94676.

It is an arithmetic number, because the mean of its divisors is an integer number (6032880).

Almost surely, 2^128488431 is an apocalyptic number.

128488431 is a deficient number, since it is larger than the sum of its proper divisors (64563729).

128488431 is a wasteful number, since it uses less digits than its factorization.

128488431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503.

The product of its digits is 49152, while the sum is 39.

The square root of 128488431 is about 11335.2737505541. The cubic root of 128488431 is about 504.6086318451.

The spelling of 128488431 in words is "one hundred twenty-eight million, four hundred eighty-eight thousand, four hundred thirty-one".