63991222 has 16 divisors (see below), whose sum is σ = 97812000. Its totient is φ = 31393152.

The previous prime is 63991211. The next prime is 63991229. The reversal of 63991222 is 22219936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63991229) 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, 21904 + ... + 24652.

It is an arithmetic number, because the mean of its divisors is an integer number (6113250).

Almost surely, 2^63991222 is an apocalyptic number.

63991222 is a deficient number, since it is larger than the sum of its proper divisors (33820778).

63991222 is a wasteful number, since it uses less digits than its factorization.

63991222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967.

The product of its digits is 11664, while the sum is 34.

The square root of 63991222 is about 7999.4513561869. The cubic root of 63991222 is about 399.9817116639.

The spelling of 63991222 in words is "sixty-three million, nine hundred ninety-one thousand, two hundred twenty-two".