63243721 has 8 divisors (see below), whose sum is σ = 66478464. Its totient is φ = 60049440.

The previous prime is 63243707. The next prime is 63243737. The reversal of 63243721 is 12734236.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63243721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63243721.

It is not an unprimeable number, because it can be changed into a prime (63243701) 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, 6885 + ... + 13186.

It is an arithmetic number, because the mean of its divisors is an integer number (8309808).

Almost surely, 2^63243721 is an apocalyptic number.

It is an amenable number.

63243721 is a deficient number, since it is larger than the sum of its proper divisors (3234743).

63243721 is a wasteful number, since it uses less digits than its factorization.

63243721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20231.

The product of its digits is 6048, while the sum is 28.

The square root of 63243721 is about 7952.5920931480. The cubic root of 63243721 is about 398.4181715427.

Adding to 63243721 its reverse (12734236), we get a palindrome (75977957).

The spelling of 63243721 in words is "sixty-three million, two hundred forty-three thousand, seven hundred twenty-one".