642225228 has 24 divisors (see below), whose sum is σ = 1563679488. Its totient is φ = 204767376.

The previous prime is 642225211. The next prime is 642225229. The reversal of 642225228 is 822522246.

It is not an unprimeable number, because it can be changed into a prime (642225229) 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 7 ways as a sum of consecutive naturals, for example, 1163176 + ... + 1163727.

It is an arithmetic number, because the mean of its divisors is an integer number (65153312).

Almost surely, 2^642225228 is an apocalyptic number.

It is an amenable number.

642225228 is an abundant number, since it is smaller than the sum of its proper divisors (921454260).

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

642225228 is a wasteful number, since it uses less digits than its factorization.

642225228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2326933 (or 2326931 counting only the distinct ones).

The product of its digits is 30720, while the sum is 33.

The square root of 642225228 is about 25342.1630489585. The cubic root of 642225228 is about 862.7714932757.

The spelling of 642225228 in words is "six hundred forty-two million, two hundred twenty-five thousand, two hundred twenty-eight".