641626452 has 18 divisors (see below), whose sum is σ = 1621889178. Its totient is φ = 213875472.

The previous prime is 641626451. The next prime is 641626459. The reversal of 641626452 is 254626146.

641626452 is a `hidden beast` number, since 6 + 4 + 1 + 6 + 2 + 645 + 2 = 666.

641626452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 438734916 + 202891536 = 20946^2 + 14244^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×641626452² = 823369007812216608, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 17822957 = 641626452 / (6 + 4 + 1 + 6 + 2 + 6 + 4 + 5 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641626451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8911443 + ... + 8911514.

Almost surely, 2^641626452 is an apocalyptic number.

It is an amenable number.

641626452 is an abundant number, since it is smaller than the sum of its proper divisors (980262726).

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

641626452 is a wasteful number, since it uses less digits than its factorization.

641626452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17822967 (or 17822962 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 641626452 is about 25330.3464642709. The cubic root of 641626452 is about 862.5032761060.

The spelling of 641626452 in words is "six hundred forty-one million, six hundred twenty-six thousand, four hundred fifty-two".