641264 has 20 divisors (see below), whose sum is σ = 1338456. Its totient is φ = 295872.

The previous prime is 641261. The next prime is 641279. The reversal of 641264 is 462146.

It is a happy number.

It is a super-2 number, since 2×641264² = 822439035392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1334 + ... + 1749.

2⁶⁴¹²⁶⁴ is an apocalyptic number.

It is an amenable number.

641264 is an abundant number, since it is smaller than the sum of its proper divisors (697192).

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

641264 is a wasteful number, since it uses less digits than its factorization.

641264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104 (or 3098 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 641264 is about 800.7896103222. The cubic root of 641264 is about 86.2340837395.

The spelling of 641264 in words is "six hundred forty-one thousand, two hundred sixty-four".