641789436 has 24 divisors (see below), whose sum is σ = 1508943744. Its totient is φ = 212296240.

The previous prime is 641789399. The next prime is 641789437. The reversal of 641789436 is 634987146.

It is a super-2 number, since 2×641789436² = 823787360322396192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641789437) 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, 202560 + ... + 205703.

It is an arithmetic number, because the mean of its divisors is an integer number (62872656).

Almost surely, 2^641789436 is an apocalyptic number.

It is an amenable number.

641789436 is an abundant number, since it is smaller than the sum of its proper divisors (867154308).

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

641789436 is a wasteful number, since it uses less digits than its factorization.

641789436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408401 (or 408399 counting only the distinct ones).

The product of its digits is 870912, while the sum is 48.

The square root of 641789436 is about 25333.5634287796. The cubic root of 641789436 is about 862.5763000763.

The spelling of 641789436 in words is "six hundred forty-one million, seven hundred eighty-nine thousand, four hundred thirty-six".