641472768 has 108 divisors (see below), whose sum is σ = 1863760080. Its totient is φ = 212179968.

The previous prime is 641472763. The next prime is 641472787. The reversal of 641472768 is 867274146.

It is a super-2 number, since 2×641472768² = 822974624171163648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641472763) 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, 319255 + ... + 321257.

Almost surely, 2^641472768 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 641472768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (931880040).

641472768 is an abundant number, since it is smaller than the sum of its proper divisors (1222287312).

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

641472768 is a wasteful number, since it uses less digits than its factorization.

641472768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164 (or 2147 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 641472768 is about 25327.3126880844. The cubic root of 641472768 is about 862.4344076143.

The spelling of 641472768 in words is "six hundred forty-one million, four hundred seventy-two thousand, seven hundred sixty-eight".