642888220 has 48 divisors (see below), whose sum is σ = 1457543808. Its totient is φ = 236782080.

The previous prime is 642888217. The next prime is 642888221. The reversal of 642888220 is 22888246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642888221) 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 15 ways as a sum of consecutive naturals, for example, 109192 + ... + 114928.

It is an arithmetic number, because the mean of its divisors is an integer number (30365496).

Almost surely, 2^642888220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642888220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (728771904).

642888220 is an abundant number, since it is smaller than the sum of its proper divisors (814655588).

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

642888220 is a wasteful number, since it uses less digits than its factorization.

642888220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6190 (or 6188 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 40.

The square root of 642888220 is about 25355.2404839710. The cubic root of 642888220 is about 863.0682810952.

The spelling of 642888220 in words is "six hundred forty-two million, eight hundred eighty-eight thousand, two hundred twenty".