641347720 has 32 divisors (see below), whose sum is σ = 1554036120. Its totient is φ = 236805120.

The previous prime is 641347691. The next prime is 641347739. The reversal of 641347720 is 27743146.

641347720 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 297838564 + 343509156 = 17258^2 + 18534^2 .

It is a super-2 number, since 2×641347720² = 822653795898396800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 616161 + ... + 617200.

Almost surely, 2^641347720 is an apocalyptic number.

It is an amenable number.

641347720 is an abundant number, since it is smaller than the sum of its proper divisors (912688400).

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

641347720 is a wasteful number, since it uses less digits than its factorization.

641347720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233385 (or 1233381 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 641347720 is about 25324.8439284431. The cubic root of 641347720 is about 862.3783632989.

The spelling of 641347720 in words is "six hundred forty-one million, three hundred forty-seven thousand, seven hundred twenty".