63667944 has 72 divisors (see below), whose sum is σ = 179204610. Its totient is φ = 21205152.

The previous prime is 63667943. The next prime is 63667951. The reversal of 63667944 is 44976636.

63667944 is a `hidden beast` number, since 636 + 6 + 7 + 9 + 4 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63011844 + 656100 = 7938^2 + 810^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 63667944.

It is not an unprimeable number, because it can be changed into a prime (63667943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 51882 + ... + 53094.

Almost surely, 2^63667944 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 63667944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89602305).

63667944 is an abundant number, since it is smaller than the sum of its proper divisors (115536666).

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

63667944 is an equidigital number, since it uses as much as digits as its factorization.

63667944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243 (or 1218 counting only the distinct ones).

The product of its digits is 653184, while the sum is 45.

The square root of 63667944 is about 7979.2195107040. The cubic root of 63667944 is about 399.3070167957.

The spelling of 63667944 in words is "sixty-three million, six hundred sixty-seven thousand, nine hundred forty-four".