642609130 has 16 divisors (see below), whose sum is σ = 1157653800. Its totient is φ = 256830912.

The previous prime is 642609119. The next prime is 642609139. The reversal of 642609130 is 31906246.

It can be written as a sum of positive squares in 4 ways, for example, as 504945841 + 137663289 = 22471^2 + 11733^2 .

It is a junction number, because it is equal to n+sod(n) for n = 642609092 and 642609101.

It is not an unprimeable number, because it can be changed into a prime (642609139) 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, 13605 + ... + 38344.

Almost surely, 2^642609130 is an apocalyptic number.

642609130 is a deficient number, since it is larger than the sum of its proper divisors (515044670).

642609130 is a wasteful number, since it uses less digits than its factorization.

642609130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53193.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 642609130 is about 25349.7362905416. The cubic root of 642609130 is about 862.9433715679.

The spelling of 642609130 in words is "six hundred forty-two million, six hundred nine thousand, one hundred thirty".