63721623 has 16 divisors (see below), whose sum is σ = 98551040. Its totient is φ = 35868096.

The previous prime is 63721589. The next prime is 63721639. The reversal of 63721623 is 32612736.

63721623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 63721623 - 2⁹ = 63721111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63721663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21238 + ... + 24051.

It is an arithmetic number, because the mean of its divisors is an integer number (6159440).

Almost surely, 2^63721623 is an apocalyptic number.

63721623 is a deficient number, since it is larger than the sum of its proper divisors (34829417).

63721623 is a wasteful number, since it uses less digits than its factorization.

63721623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45366.

The product of its digits is 9072, while the sum is 30.

The square root of 63721623 is about 7982.5824768680. The cubic root of 63721623 is about 399.4192050178.

The spelling of 63721623 in words is "sixty-three million, seven hundred twenty-one thousand, six hundred twenty-three".