642173130 has 64 divisors (see below), whose sum is σ = 1813207680. Its totient is φ = 161171712.

The previous prime is 642173111. The next prime is 642173131. The reversal of 642173130 is 31371246.

642173130 is a `hidden beast` number, since 642 + 1 + 7 + 3 + 13 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 642173094 and 642173103.

It is not an unprimeable number, because it can be changed into a prime (642173131) 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 in 31 ways as a sum of consecutive naturals, for example, 65364 + ... + 74543.

It is an arithmetic number, because the mean of its divisors is an integer number (28331370).

Almost surely, 2^642173130 is an apocalyptic number.

642173130 is an abundant number, since it is smaller than the sum of its proper divisors (1171034550).

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

642173130 is a wasteful number, since it uses less digits than its factorization.

642173130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139940 (or 139934 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 642173130 is about 25341.1351363746. The cubic root of 642173130 is about 862.7481629949.

The spelling of 642173130 in words is "six hundred forty-two million, one hundred seventy-three thousand, one hundred thirty".