641394260 has 96 divisors (see below), whose sum is σ = 1515548832. Its totient is φ = 226437120.

The previous prime is 641394227. The next prime is 641394269. The reversal of 641394260 is 62493146.

641394260 is digitally balanced in base 2, 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 16 ways, for example, as 97851664 + 543542596 = 9892^2 + 23314^2 .

It is a super-2 number, since 2×641394260² = 822773193521895200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641394260.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641394269) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 586274 + ... + 587366.

It is an arithmetic number, because the mean of its divisors is an integer number (15786967).

Almost surely, 2^641394260 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 641394260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (757774416).

641394260 is an abundant number, since it is smaller than the sum of its proper divisors (874154572).

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

641394260 is a wasteful number, since it uses less digits than its factorization.

641394260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213 (or 1211 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 641394260 is about 25325.7627723234. The cubic root of 641394260 is about 862.3992225598.

The spelling of 641394260 in words is "six hundred forty-one million, three hundred ninety-four thousand, two hundred sixty".