641278823 has 8 divisors (see below), whose sum is σ = 690729600. Its totient is φ = 593398008.

The previous prime is 641278819. The next prime is 641278829. The reversal of 641278823 is 328872146.

641278823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641278823 - 2² = 641278819 is a prime.

It is a super-2 number, since 2×641278823² = 822477057656530658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641278829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391643 + ... + 393276.

It is an arithmetic number, because the mean of its divisors is an integer number (86341200).

Almost surely, 2^641278823 is an apocalyptic number.

641278823 is a deficient number, since it is larger than the sum of its proper divisors (49450777).

641278823 is a wasteful number, since it uses less digits than its factorization.

641278823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784981.

The product of its digits is 129024, while the sum is 41.

The square root of 641278823 is about 25323.4836268630. The cubic root of 641278823 is about 862.3474817620.

The spelling of 641278823 in words is "six hundred forty-one million, two hundred seventy-eight thousand, eight hundred twenty-three".