641060864 has 52 divisors (see below), whose sum is σ = 1306595556. Its totient is φ = 314376192.

The previous prime is 641060843. The next prime is 641060897. The reversal of 641060864 is 468060146.

It can be written as a sum of positive squares in 2 ways, for example, as 493195264 + 147865600 = 22208^2 + 12160^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215612 + ... + 218564.

Almost surely, 2^641060864 is an apocalyptic number.

641060864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641060864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (653297778).

641060864 is an abundant number, since it is smaller than the sum of its proper divisors (665534692).

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

641060864 is an equidigital number, since it uses as much as digits as its factorization.

641060864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030 (or 3008 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 641060864 is about 25319.1797655453. The cubic root of 641060864 is about 862.2497719535.

The spelling of 641060864 in words is "six hundred forty-one million, sixty thousand, eight hundred sixty-four".