641244144 has 40 divisors (see below), whose sum is σ = 1657728720. Its totient is φ = 213595648.

The previous prime is 641244137. The next prime is 641244161. The reversal of 641244144 is 441442146.

641244144 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×641244144² = 822388104428585472, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78124 + ... + 85940.

It is an arithmetic number, because the mean of its divisors is an integer number (41443218).

Almost surely, 2^641244144 is an apocalyptic number.

It is an amenable number.

641244144 is an abundant number, since it is smaller than the sum of its proper divisors (1016484576).

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

641244144 is a wasteful number, since it uses less digits than its factorization.

641244144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9537 (or 9531 counting only the distinct ones).

The product of its digits is 12288, while the sum is 30.

The square root of 641244144 is about 25322.7988974363. The cubic root of 641244144 is about 862.3319368403.

The spelling of 641244144 in words is "six hundred forty-one million, two hundred forty-four thousand, one hundred forty-four".