646428222288 has 60 divisors (see below), whose sum is σ = 1809283070868. Its totient is φ = 215454412800.

The previous prime is 646428222277. The next prime is 646428222289. The reversal of 646428222288 is 882222824646.

646428222288 is a `hidden beast` number, since 6 + 4 + 64 + 282 + 22 + 288 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 354063081024 + 292365141264 = 595032^2 + 540708^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646428222289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1244938 + ... + 1686038.

Almost surely, 2^646428222288 is an apocalyptic number.

It is an amenable number.

646428222288 is an abundant number, since it is smaller than the sum of its proper divisors (1162854848580).

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

646428222288 is a wasteful number, since it uses less digits than its factorization.

646428222288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451292 (or 451283 counting only the distinct ones).

The product of its digits is 9437184, while the sum is 54.

The spelling of 646428222288 in words is "six hundred forty-six billion, four hundred twenty-eight million, two hundred twenty-two thousand, two hundred eighty-eight".