642404442 has 16 divisors (see below), whose sum is σ = 1303985952. Its totient is φ = 210938640.

The previous prime is 642404417. The next prime is 642404447. The reversal of 642404442 is 244404246.

It is not an unprimeable number, because it can be changed into a prime (642404447) 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, 798609 + ... + 799412.

It is an arithmetic number, because the mean of its divisors is an integer number (81499122).

Almost surely, 2^642404442 is an apocalyptic number.

642404442 is an abundant number, since it is smaller than the sum of its proper divisors (661581510).

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

642404442 is a wasteful number, since it uses less digits than its factorization.

642404442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1598093.

The product of its (nonzero) digits is 24576, while the sum is 30.

The square root of 642404442 is about 25345.6986883376. The cubic root of 642404442 is about 862.8517384107.

Adding to 642404442 its reverse (244404246), we get a palindrome (886808688).

The spelling of 642404442 in words is "six hundred forty-two million, four hundred four thousand, four hundred forty-two".