642431142 has 64 divisors (see below), whose sum is σ = 1483185600. Its totient is φ = 205873920.

The previous prime is 642431129. The next prime is 642431183. The reversal of 642431142 is 241134246.

It is a happy number.

642431142 is a `hidden beast` number, since 642 + 4 + 3 + 1 + 14 + 2 = 666.

It is a super-2 number, since 2×642431142² = 825435544422848328, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 433042 + ... + 434522.

It is an arithmetic number, because the mean of its divisors is an integer number (23174775).

Almost surely, 2^642431142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642431142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (741592800).

642431142 is an abundant number, since it is smaller than the sum of its proper divisors (840754458).

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

642431142 is a wasteful number, since it uses less digits than its factorization.

642431142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798 (or 1792 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 642431142 is about 25346.2253994554. The cubic root of 642431142 is about 862.8636923661.

Adding to 642431142 its reverse (241134246), we get a palindrome (883565388).

The spelling of 642431142 in words is "six hundred forty-two million, four hundred thirty-one thousand, one hundred forty-two".