646044841 has 4 divisors (see below), whose sum is σ = 695740612. Its totient is φ = 596349072.

The previous prime is 646044823. The next prime is 646044851. The reversal of 646044841 is 148440646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 221890816 + 424154025 = 14896^2 + 20595^2 .

It is a cyclic number.

It is not a de Polignac number, because 646044841 - 2⁷ = 646044713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646044841.

It is not an unprimeable number, because it can be changed into a prime (646044811) 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, 24847866 + ... + 24847891.

It is an arithmetic number, because the mean of its divisors is an integer number (173935153).

Almost surely, 2^646044841 is an apocalyptic number.

It is an amenable number.

646044841 is a deficient number, since it is larger than the sum of its proper divisors (49695771).

646044841 is a wasteful number, since it uses less digits than its factorization.

646044841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49695770.

The product of its (nonzero) digits is 73728, while the sum is 37.

The square root of 646044841 is about 25417.4121617446. The cubic root of 646044841 is about 864.4785483558.

The spelling of 646044841 in words is "six hundred forty-six million, forty-four thousand, eight hundred forty-one".