642173164 has 24 divisors (see below), whose sum is σ = 1195045488. Its totient is φ = 300894720.

The previous prime is 642173131. The next prime is 642173167. The reversal of 642173164 is 461371246.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (642173167) 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, 4422 + ... + 36109.

It is an arithmetic number, because the mean of its divisors is an integer number (49793562).

Almost surely, 2^642173164 is an apocalyptic number.

It is an amenable number.

642173164 is a deficient number, since it is larger than the sum of its proper divisors (552872324).

642173164 is a wasteful number, since it uses less digits than its factorization.

642173164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40785 (or 40783 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 642173164 is about 25341.1358072206. The cubic root of 642173164 is about 862.7481782211.

The spelling of 642173164 in words is "six hundred forty-two million, one hundred seventy-three thousand, one hundred sixty-four".