642163172 has 12 divisors (see below), whose sum is σ = 1284326400. Its totient is φ = 275212776.

The previous prime is 642163133. The next prime is 642163177. The reversal of 642163172 is 271361246.

642163172 is an admirable number.

It is a super-3 number, since 3×642163172³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (642163177) 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 3 ways as a sum of consecutive naturals, for example, 11467172 + ... + 11467227.

It is an arithmetic number, because the mean of its divisors is an integer number (107027200).

Almost surely, 2^642163172 is an apocalyptic number.

It is an amenable number.

642163172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

642163172 is a wasteful number, since it uses less digits than its factorization.

642163172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22934410 (or 22934408 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 642163172 is about 25340.9386566481. The cubic root of 642163172 is about 862.7437035067.

The spelling of 642163172 in words is "six hundred forty-two million, one hundred sixty-three thousand, one hundred seventy-two".