63287721 has 12 divisors (see below), whose sum is σ = 104475072. Its totient is φ = 36164376.

The previous prime is 63287717. The next prime is 63287729. The reversal of 63287721 is 12778236.

It is not a de Polignac number, because 63287721 - 2² = 63287717 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63287729) 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, 502221 + ... + 502346.

It is an arithmetic number, because the mean of its divisors is an integer number (8706256).

Almost surely, 2^63287721 is an apocalyptic number.

It is an amenable number.

63287721 is a deficient number, since it is larger than the sum of its proper divisors (41187351).

63287721 is a wasteful number, since it uses less digits than its factorization.

63287721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004580 (or 1004577 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 63287721 is about 7955.3580057720. The cubic root of 63287721 is about 398.5105461185.

The spelling of 63287721 in words is "sixty-three million, two hundred eighty-seven thousand, seven hundred twenty-one".