641909296 has 80 divisors (see below), whose sum is σ = 1459192320. Its totient is φ = 267886080.

The previous prime is 641909267. The next prime is 641909297. The reversal of 641909296 is 692909146.

It is not an unprimeable number, because it can be changed into a prime (641909297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 707275 + ... + 708181.

It is an arithmetic number, because the mean of its divisors is an integer number (18239904).

Almost surely, 2^641909296 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 641909296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (729596160).

641909296 is an abundant number, since it is smaller than the sum of its proper divisors (817283024).

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

641909296 is a wasteful number, since it uses less digits than its factorization.

641909296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082 (or 1076 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 641909296 is about 25335.9289547472. The cubic root of 641909296 is about 862.6299947171.

The spelling of 641909296 in words is "six hundred forty-one million, nine hundred nine thousand, two hundred ninety-six".