641744240 has 40 divisors (see below), whose sum is σ = 1507455600. Its totient is φ = 254048256.

The previous prime is 641744227. The next prime is 641744249. The reversal of 641744240 is 42447146.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 641744197 and 641744206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641744249) 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, 33590 + ... + 49109.

It is an arithmetic number, because the mean of its divisors is an integer number (37686390).

Almost surely, 2^641744240 is an apocalyptic number.

It is an amenable number.

641744240 is an abundant number, since it is smaller than the sum of its proper divisors (865711360).

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

641744240 is a wasteful number, since it uses less digits than its factorization.

641744240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82809 (or 82803 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 641744240 is about 25332.6713948608. The cubic root of 641744240 is about 862.5560515278.

The spelling of 641744240 in words is "six hundred forty-one million, seven hundred forty-four thousand, two hundred forty".