63999744 has 72 divisors (see below), whose sum is σ = 171696000. Its totient is φ = 21163008.

The previous prime is 63999709. The next prime is 63999763. The reversal of 63999744 is 44799936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128007 + ... + 128505.

Almost surely, 2^63999744 is an apocalyptic number.

63999744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63999744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85848000).

63999744 is an abundant number, since it is smaller than the sum of its proper divisors (107696256).

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

63999744 is a wasteful number, since it uses less digits than its factorization.

63999744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685 (or 671 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 51.

The square root of 63999744 is about 7999.9839999840. The cubic root of 63999744 is about 399.9994666660. Note that the first 3 decimals are identical.

The spelling of 63999744 in words is "sixty-three million, nine hundred ninety-nine thousand, seven hundred forty-four".