646814444 has 12 divisors (see below), whose sum is σ = 1132286904. Its totient is φ = 323303904.

The previous prime is 646814437. The next prime is 646814459. The reversal of 646814444 is 444418646.

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, 10769 + ... + 37544.

It is an arithmetic number, because the mean of its divisors is an integer number (94357242).

Almost surely, 2^646814444 is an apocalyptic number.

It is an amenable number.

646814444 is a deficient number, since it is larger than the sum of its proper divisors (485472460).

646814444 is a wasteful number, since it uses less digits than its factorization.

646814444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51664 (or 51662 counting only the distinct ones).

The product of its digits is 294912, while the sum is 41.

The square root of 646814444 is about 25432.5469428447. The cubic root of 646814444 is about 864.8216830912.

The spelling of 646814444 in words is "six hundred forty-six million, eight hundred fourteen thousand, four hundred forty-four".