641304976 has 45 divisors (see below), whose sum is σ = 1348228161. Its totient is φ = 295379136.

The previous prime is 641304971. The next prime is 641304977. The reversal of 641304976 is 679403146.

The square root of 641304976 is 25324.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 94867600 + 546437376 = 9740^2 + 23376^2 .

It is a super-2 number, since 2×641304976² = 822544144484721152, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641304971) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1316605 + ... + 1317091.

Almost surely, 2^641304976 is an apocalyptic number.

641304976 is the 25324-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641304976

641304976 is an abundant number, since it is smaller than the sum of its proper divisors (706923185).

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

641304976 is an equidigital number, since it uses as much as digits as its factorization.

641304976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The cubic root of 641304976 is about 862.3592045189.

The spelling of 641304976 in words is "six hundred forty-one million, three hundred four thousand, nine hundred seventy-six".