641964 has 24 divisors (see below), whose sum is σ = 1524208. Its totient is φ = 210240.

The previous prime is 641959. The next prime is 641969. The reversal of 641964 is 469146.

641964 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (641959) and next prime (641969).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294 + ... + 1170.

2⁶⁴¹⁹⁶⁴ is an apocalyptic number.

It is an amenable number.

641964 is an abundant number, since it is smaller than the sum of its proper divisors (882244).

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

641964 is a wasteful number, since it uses less digits than its factorization.

641964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945 (or 943 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 641964 is about 801.2265597195. The cubic root of 641964 is about 86.2654498683.

The spelling of 641964 in words is "six hundred forty-one thousand, nine hundred sixty-four".