642218160 has 40 divisors (see below), whose sum is σ = 1990877040. Its totient is φ = 171258112.

The previous prime is 642218131. The next prime is 642218177. The reversal of 642218160 is 61812246.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1337715 + ... + 1338194.

It is an arithmetic number, because the mean of its divisors is an integer number (49771926).

Almost surely, 2^642218160 is an apocalyptic number.

642218160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642218160 is an abundant number, since it is smaller than the sum of its proper divisors (1348658880).

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

642218160 is a wasteful number, since it uses less digits than its factorization.

642218160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2675925 (or 2675919 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 642218160 is about 25342.0235971794. The cubic root of 642218160 is about 862.7683281913.

The spelling of 642218160 in words is "six hundred forty-two million, two hundred eighteen thousand, one hundred sixty".