63980721 has 36 divisors (see below), whose sum is σ = 109371600. Its totient is φ = 35926128.

The previous prime is 63980717. The next prime is 63980723. The reversal of 63980721 is 12708936.

It is not a de Polignac number, because 63980721 - 2² = 63980717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63980723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 24790 + ... + 27248.

It is an arithmetic number, because the mean of its divisors is an integer number (3038100).

Almost surely, 2^63980721 is an apocalyptic number.

It is an amenable number.

63980721 is a deficient number, since it is larger than the sum of its proper divisors (45390879).

63980721 is a wasteful number, since it uses less digits than its factorization.

63980721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538 (or 2528 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 63980721 is about 7998.7949717442. The cubic root of 63980721 is about 399.9598313830.

The spelling of 63980721 in words is "sixty-three million, nine hundred eighty thousand, seven hundred twenty-one".