63720173 has 24 divisors (see below), whose sum is σ = 72729720. Its totient is φ = 55756800.

The previous prime is 63720169. The next prime is 63720187. The reversal of 63720173 is 37102736.

It can be written as a sum of positive squares in 4 ways, for example, as 644809 + 63075364 = 803^2 + 7942^2 .

It is not a de Polignac number, because 63720173 - 2² = 63720169 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63720113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 656861 + ... + 656957.

It is an arithmetic number, because the mean of its divisors is an integer number (3030405).

Almost surely, 2^63720173 is an apocalyptic number.

It is an amenable number.

63720173 is a deficient number, since it is larger than the sum of its proper divisors (9009547).

63720173 is a wasteful number, since it uses less digits than its factorization.

63720173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 29.

The square root of 63720173 is about 7982.4916536129. The cubic root of 63720173 is about 399.4161753699.

The spelling of 63720173 in words is "sixty-three million, seven hundred twenty thousand, one hundred seventy-three".