642130044 has 12 divisors (see below), whose sum is σ = 1498303464. Its totient is φ = 214043344.

The previous prime is 642130039. The next prime is 642130057. The reversal of 642130044 is 440031246.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 642129996 and 642130023.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26755407 + ... + 26755430.

It is an arithmetic number, because the mean of its divisors is an integer number (124858622).

Almost surely, 2^642130044 is an apocalyptic number.

It is an amenable number.

642130044 is an abundant number, since it is smaller than the sum of its proper divisors (856173420).

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

642130044 is a wasteful number, since it uses less digits than its factorization.

642130044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53510844 (or 53510842 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 642130044 is about 25340.2850023436. The cubic root of 642130044 is about 862.7288674722.

The spelling of 642130044 in words is "six hundred forty-two million, one hundred thirty thousand, forty-four".