641255744 has 28 divisors (see below), whose sum is σ = 1303533588. Its totient is φ = 312806400.

The previous prime is 641255737. The next prime is 641255749. The reversal of 641255744 is 447552146.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 178489600 + 462766144 = 13360^2 + 21512^2 .

It is a super-2 number, since 2×641255744² = 822417858425987072, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641255698 and 641255707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641255749) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 119567 + ... + 124814.

It is an arithmetic number, because the mean of its divisors is an integer number (46554771).

Almost surely, 2^641255744 is an apocalyptic number.

641255744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

641255744 is an abundant number, since it is smaller than the sum of its proper divisors (662277844).

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

641255744 is a wasteful number, since it uses less digits than its factorization.

641255744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244434 (or 244424 counting only the distinct ones).

The product of its digits is 134400, while the sum is 38.

The square root of 641255744 is about 25323.0279390123. The cubic root of 641255744 is about 862.3371366227.

The spelling of 641255744 in words is "six hundred forty-one million, two hundred fifty-five thousand, seven hundred forty-four".