63996736 has 56 divisors (see below), whose sum is σ = 134736840. Its totient is φ = 30141440.

The previous prime is 63996733. The next prime is 63996743. The reversal of 63996736 is 63769936.

It can be written as a sum of positive squares in 4 ways, for example, as 3779136 + 60217600 = 1944^2 + 7760^2 .

Its product of digits (1102248) is a multiple of the sum of its prime divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 63996736.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63996733) 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, 1560876 + ... + 1560916.

It is an arithmetic number, because the mean of its divisors is an integer number (2406015).

Almost surely, 2^63996736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63996736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67368420).

63996736 is an abundant number, since it is smaller than the sum of its proper divisors (70740104).

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

63996736 is an frugal number, since it uses more digits than its factorization.

63996736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 72 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 49.

The square root of 63996736 is about 7999.7959973989. The cubic root of 63996736 is about 399.9931998844.

The spelling of 63996736 in words is "sixty-three million, nine hundred ninety-six thousand, seven hundred thirty-six".