641787344 has 40 divisors (see below), whose sum is σ = 1378765920. Its totient is φ = 286934400.

The previous prime is 641787343. The next prime is 641787373. The reversal of 641787344 is 443787146.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 641787295 and 641787304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641787343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19154 + ... + 40625.

It is an arithmetic number, because the mean of its divisors is an integer number (34469148).

Almost surely, 2^641787344 is an apocalyptic number.

It is an amenable number.

641787344 is an abundant number, since it is smaller than the sum of its proper divisors (736978576).

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

641787344 is a wasteful number, since it uses less digits than its factorization.

641787344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59859 (or 59853 counting only the distinct ones).

The product of its digits is 451584, while the sum is 44.

The square root of 641787344 is about 25333.5221396473. The cubic root of 641787344 is about 862.5753628470.

The spelling of 641787344 in words is "six hundred forty-one million, seven hundred eighty-seven thousand, three hundred forty-four".