641233940 has 24 divisors (see below), whose sum is σ = 1350852552. Its totient is φ = 255681920.

The previous prime is 641233937. The next prime is 641233963. The reversal of 641233940 is 49332146.

It can be written as a sum of positive squares in 4 ways, for example, as 29463184 + 611770756 = 5428^2 + 24734^2 .

It is a super-2 number, since 2×641233940² = 822361931615847200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641233897 and 641233906.

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, 44231 + ... + 56910.

It is an arithmetic number, because the mean of its divisors is an integer number (56285523).

Almost surely, 2^641233940 is an apocalyptic number.

It is an amenable number.

641233940 is an abundant number, since it is smaller than the sum of its proper divisors (709618612).

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

641233940 is a wasteful number, since it uses less digits than its factorization.

641233940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101467 (or 101465 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 641233940 is about 25322.5974181165. The cubic root of 641233940 is about 862.3273627729.

The spelling of 641233940 in words is "six hundred forty-one million, two hundred thirty-three thousand, nine hundred forty".