128555742 has 32 divisors (see below), whose sum is σ = 296704512. Its totient is φ = 36372384.

The previous prime is 128555737. The next prime is 128555747. The reversal of 128555742 is 247555821.

It is an interprime number because it is at equal distance from previous prime (128555737) and next prime (128555747).

It is a self number, because there is not a number n which added to its sum of digits gives 128555742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128555747) 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 15 ways as a sum of consecutive naturals, for example, 10533 + ... + 19184.

It is an arithmetic number, because the mean of its divisors is an integer number (9272016).

Almost surely, 2^128555742 is an apocalyptic number.

128555742 is an abundant number, since it is smaller than the sum of its proper divisors (168148770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128555742 is a wasteful number, since it uses less digits than its factorization.

128555742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29832.

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

The square root of 128555742 is about 11338.2424563951. The cubic root of 128555742 is about 504.6967325970.

The spelling of 128555742 in words is "one hundred twenty-eight million, five hundred fifty-five thousand, seven hundred forty-two".