642900538 has 8 divisors (see below), whose sum is σ = 1102115232. Its totient is φ = 275528796.

The previous prime is 642900529. The next prime is 642900539. The reversal of 642900538 is 835009246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×642900538² = 826642203521378888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642900497 and 642900506.

It is not an unprimeable number, because it can be changed into a prime (642900539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22960720 + ... + 22960747.

It is an arithmetic number, because the mean of its divisors is an integer number (137764404).

Almost surely, 2^642900538 is an apocalyptic number.

642900538 is a deficient number, since it is larger than the sum of its proper divisors (459214694).

642900538 is a wasteful number, since it uses less digits than its factorization.

642900538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45921476.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 642900538 is about 25355.4833911720. The cubic root of 642900538 is about 863.0737933065.

The spelling of 642900538 in words is "six hundred forty-two million, nine hundred thousand, five hundred thirty-eight".