63720439 has 4 divisors (see below), whose sum is σ = 63788256. Its totient is φ = 63652624.

The previous prime is 63720431. The next prime is 63720443. The reversal of 63720439 is 93402736.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63720439 - 2³ = 63720431 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 (63720431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32479 + ... + 34384.

It is an arithmetic number, because the mean of its divisors is an integer number (15947064).

Almost surely, 2^63720439 is an apocalyptic number.

63720439 is a deficient number, since it is larger than the sum of its proper divisors (67817).

63720439 is an equidigital number, since it uses as much as digits as its factorization.

63720439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67816.

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 63720439 is about 7982.5083150599. The cubic root of 63720439 is about 399.4167311570.

The spelling of 63720439 in words is "sixty-three million, seven hundred twenty thousand, four hundred thirty-nine".