63720217 has 4 divisors (see below), whose sum is σ = 69512976. Its totient is φ = 57927460.

The previous prime is 63720197. The next prime is 63720247. The reversal of 63720217 is 71202736.

63720217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63720217 - 2⁷ = 63720089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63720247) 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 3 ways as a sum of consecutive naturals, for example, 2896363 + ... + 2896384.

It is an arithmetic number, because the mean of its divisors is an integer number (17378244).

Almost surely, 2^63720217 is an apocalyptic number.

It is an amenable number.

63720217 is a deficient number, since it is larger than the sum of its proper divisors (5792759).

63720217 is a wasteful number, since it uses less digits than its factorization.

63720217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5792758.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 63720217 is about 7982.4944096441. The cubic root of 63720217 is about 399.4162673047.

The spelling of 63720217 in words is "sixty-three million, seven hundred twenty thousand, two hundred seventeen".