646244404 has 12 divisors (see below), whose sum is σ = 1217922244. Its totient is φ = 298266624.

The previous prime is 646244393. The next prime is 646244447. The reversal of 646244404 is 404442646.

It can be written as a sum of positive squares in 2 ways, for example, as 28622500 + 617621904 = 5350^2 + 24852^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 646244404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6213837 + ... + 6213940.

Almost surely, 2^646244404 is an apocalyptic number.

It is an amenable number.

646244404 is a deficient number, since it is larger than the sum of its proper divisors (571677840).

646244404 is a wasteful number, since it uses less digits than its factorization.

646244404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12427794 (or 12427792 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 34.

The square root of 646244404 is about 25421.3375729917. The cubic root of 646244404 is about 864.5675515545.

The spelling of 646244404 in words is "six hundred forty-six million, two hundred forty-four thousand, four hundred four".