63991444 has 12 divisors (see below), whose sum is σ = 122165568. Its totient is φ = 29087000.

The previous prime is 63991441. The next prime is 63991453. The reversal of 63991444 is 44419936.

63991444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 63991397 and 63991406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63991441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 727132 + ... + 727219.

It is an arithmetic number, because the mean of its divisors is an integer number (10180464).

Almost surely, 2^63991444 is an apocalyptic number.

It is an amenable number.

63991444 is a deficient number, since it is larger than the sum of its proper divisors (58174124).

63991444 is a wasteful number, since it uses less digits than its factorization.

63991444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454366 (or 1454364 counting only the distinct ones).

The product of its digits is 93312, while the sum is 40.

The square root of 63991444 is about 7999.4652321265. The cubic root of 63991444 is about 399.9821742056.

The spelling of 63991444 in words is "sixty-three million, nine hundred ninety-one thousand, four hundred forty-four".