641223454428 has 72 divisors (see below), whose sum is σ = 1624278059040. Its totient is φ = 213292154880.

The previous prime is 641223454381. The next prime is 641223454457. The reversal of 641223454428 is 824454322146.

641223454428 is a `hidden beast` number, since 64 + 1 + 2 + 23 + 4 + 544 + 28 = 666.

It is a super-2 number, since 2×641223454428² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52172508 + ... + 52184796.

Almost surely, 2^641223454428 is an apocalyptic number.

It is an amenable number.

641223454428 is an abundant number, since it is smaller than the sum of its proper divisors (983054604612).

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

641223454428 is a wasteful number, since it uses less digits than its factorization.

641223454428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15227 (or 15222 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 45.

The spelling of 641223454428 in words is "six hundred forty-one billion, two hundred twenty-three million, four hundred fifty-four thousand, four hundred twenty-eight".