63744021 has 12 divisors (see below), whose sum is σ = 100445280. Its totient is φ = 38632680.

The previous prime is 63744019. The next prime is 63744061. The reversal of 63744021 is 12044736.

63744021 is a `hidden beast` number, since 637 + 4 + 4 + 0 + 21 = 666.

It is not a de Polignac number, because 63744021 - 2¹ = 63744019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63744011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 321841 + ... + 322038.

It is an arithmetic number, because the mean of its divisors is an integer number (8370440).

Almost surely, 2^63744021 is an apocalyptic number.

It is an amenable number.

63744021 is a deficient number, since it is larger than the sum of its proper divisors (36701259).

63744021 is a wasteful number, since it uses less digits than its factorization.

63744021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643896 (or 643893 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 63744021 is about 7983.9852830526. The cubic root of 63744021 is about 399.4659978381.

Adding to 63744021 its reverse (12044736), we get a palindrome (75788757).

The spelling of 63744021 in words is "sixty-three million, seven hundred forty-four thousand, twenty-one".