128742 has 16 divisors (see below), whose sum is σ = 264000. Its totient is φ = 41832.

The previous prime is 128717. The next prime is 128747. The reversal of 128742 is 247821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128747) 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, 9 + ... + 507.

It is an arithmetic number, because the mean of its divisors is an integer number (16500).

2¹²⁸⁷⁴² is an apocalyptic number.

128742 is an abundant number, since it is smaller than the sum of its proper divisors (135258).

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

128742 is a wasteful number, since it uses less digits than its factorization.

128742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547.

The product of its digits is 896, while the sum is 24.

The square root of 128742 is about 358.8063544588. The cubic root of 128742 is about 50.4940358280.

The spelling of 128742 in words is "one hundred twenty-eight thousand, seven hundred forty-two".