641712240 has 160 divisors (see below), whose sum is σ = 2380472640. Its totient is φ = 157953024.

The previous prime is 641712229. The next prime is 641712241. The reversal of 641712240 is 42217146.

641712240 is a `hidden beast` number, since 6 + 417 + 1 + 2 + 240 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641712241) 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, 16654 + ... + 39506.

It is an arithmetic number, because the mean of its divisors is an integer number (14877954).

Almost surely, 2^641712240 is an apocalyptic number.

641712240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641712240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1190236320).

641712240 is an abundant number, since it is smaller than the sum of its proper divisors (1738760400).

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

641712240 is a wasteful number, since it uses less digits than its factorization.

641712240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22888 (or 22876 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 641712240 is about 25332.0397915367. The cubic root of 641712240 is about 862.5417144286.

Adding to 641712240 its reverse (42217146), we get a palindrome (683929386).

The spelling of 641712240 in words is "six hundred forty-one million, seven hundred twelve thousand, two hundred forty".