63991228 has 12 divisors (see below), whose sum is σ = 127982512. Its totient is φ = 27424800.

The previous prime is 63991211. The next prime is 63991229. The reversal of 63991228 is 82219936.

It is a happy number.

63991228 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 1142673 + ... + 1142728.

Almost surely, 2^63991228 is an apocalyptic number.

It is an amenable number.

63991228 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63991228 is a wasteful number, since it uses less digits than its factorization.

63991228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2285412 (or 2285410 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 63991228 is about 7999.4517312126. The cubic root of 63991228 is about 399.9817241650.

The spelling of 63991228 in words is "sixty-three million, nine hundred ninety-one thousand, two hundred twenty-eight".