128555427 has 96 divisors (see below), whose sum is σ = 240330240. Its totient is φ = 59304960.

The previous prime is 128555417. The next prime is 128555437. The reversal of 128555427 is 724555821.

It is an interprime number because it is at equal distance from previous prime (128555417) and next prime (128555437).

It is not a de Polignac number, because 128555427 - 2²² = 124361123 is a prime.

It is a super-2 number, since 2×128555427² = 33052995622304658, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

Its product of digits (112000) is a multiple of the sum of its prime divisors (160).

It is not an unprimeable number, because it can be changed into a prime (128555417) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1444399 + ... + 1444487.

It is an arithmetic number, because the mean of its divisors is an integer number (2503440).

Almost surely, 2^128555427 is an apocalyptic number.

128555427 is a deficient number, since it is larger than the sum of its proper divisors (111774813).

128555427 is a wasteful number, since it uses less digits than its factorization.

128555427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 160 counting only the distinct ones).

The product of its digits is 112000, while the sum is 39.

The square root of 128555427 is about 11338.2285653448. The cubic root of 128555427 is about 504.6963203774.

It can be divided in two parts, 128 and 555427, that added together give a palindrome (555555).

The spelling of 128555427 in words is "one hundred twenty-eight million, five hundred fifty-five thousand, four hundred twenty-seven".