642534044 has 6 divisors (see below), whose sum is σ = 1124434584. Its totient is φ = 321267020.

The previous prime is 642534031. The next prime is 642534047. The reversal of 642534044 is 440435246.

It is a self number, because there is not a number n which added to its sum of digits gives 642534044.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642534047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80316752 + ... + 80316759.

It is an arithmetic number, because the mean of its divisors is an integer number (187405764).

Almost surely, 2^642534044 is an apocalyptic number.

It is an amenable number.

642534044 is a deficient number, since it is larger than the sum of its proper divisors (481900540).

642534044 is a wasteful number, since it uses less digits than its factorization.

642534044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160633515 (or 160633513 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 32.

The square root of 642534044 is about 25348.2552456772. The cubic root of 642534044 is about 862.9097599022.

The spelling of 642534044 in words is "six hundred forty-two million, five hundred thirty-four thousand, forty-four".