641550336 has 144 divisors (see below), whose sum is σ = 1990563120. Its totient is φ = 183214080.

The previous prime is 641550331. The next prime is 641550341. The reversal of 641550336 is 633055146.

It is an interprime number because it is at equal distance from previous prime (641550331) and next prime (641550341).

It is a junction number, because it is equal to n+sod(n) for n = 641550297 and 641550306.

It is not an unprimeable number, because it can be changed into a prime (641550331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 299991 + ... + 302121.

It is an arithmetic number, because the mean of its divisors is an integer number (13823355).

Almost surely, 2^641550336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641550336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (995281560).

641550336 is an abundant number, since it is smaller than the sum of its proper divisors (1349012784).

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

641550336 is a wasteful number, since it uses less digits than its factorization.

641550336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2170 (or 2143 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 641550336 is about 25328.8439530903. The cubic root of 641550336 is about 862.4691685681.

The spelling of 641550336 in words is "six hundred forty-one million, five hundred fifty thousand, three hundred thirty-six".