842128761 has 4 divisors (see below), whose sum is σ = 1122838352. Its totient is φ = 561419172.

The previous prime is 842128757. The next prime is 842128783. The reversal of 842128761 is 167821248.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 842128761 - 2² = 842128757 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (842128961) 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 3 ways as a sum of consecutive naturals, for example, 140354791 + ... + 140354796.

It is an arithmetic number, because the mean of its divisors is an integer number (280709588).

Almost surely, 2^842128761 is an apocalyptic number.

It is an amenable number.

842128761 is a deficient number, since it is larger than the sum of its proper divisors (280709591).

842128761 is a wasteful number, since it uses less digits than its factorization.

842128761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280709590.

The product of its digits is 43008, while the sum is 39.

The square root of 842128761 is about 29019.4548708276. The cubic root of 842128761 is about 944.3351747318.

The spelling of 842128761 in words is "eight hundred forty-two million, one hundred twenty-eight thousand, seven hundred sixty-one".