641509776 has 120 divisors (see below), whose sum is σ = 1848525536. Its totient is φ = 207567360.

The previous prime is 641509747. The next prime is 641509789. The reversal of 641509776 is 677905146.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1937931 + ... + 1938261.

Almost surely, 2^641509776 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 641509776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (924262768).

641509776 is an abundant number, since it is smaller than the sum of its proper divisors (1207015760).

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

641509776 is a wasteful number, since it uses less digits than its factorization.

641509776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701 (or 692 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 641509776 is about 25328.0432722309. The cubic root of 641509776 is about 862.4509925526.

The spelling of 641509776 in words is "six hundred forty-one million, five hundred nine thousand, seven hundred seventy-six".