63718889 has 4 divisors (see below), whose sum is σ = 68620356. Its totient is φ = 58817424.

The previous prime is 63718883. The next prime is 63718891. The reversal of 63718889 is 98881736.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23814400 + 39904489 = 4880^2 + 6317^2 .

It is a cyclic number.

It is not a de Polignac number, because 63718889 - 2¹⁶ = 63653353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63718883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2450714 + ... + 2450739.

It is an arithmetic number, because the mean of its divisors is an integer number (17155089).

Almost surely, 2^63718889 is an apocalyptic number.

It is an amenable number.

63718889 is a deficient number, since it is larger than the sum of its proper divisors (4901467).

63718889 is a wasteful number, since it uses less digits than its factorization.

63718889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4901466.

The product of its digits is 580608, while the sum is 50.

The square root of 63718889 is about 7982.4112271919. The cubic root of 63718889 is about 399.4134925261.

The spelling of 63718889 in words is "sixty-three million, seven hundred eighteen thousand, eight hundred eighty-nine".