63819889 has 16 divisors (see below), whose sum is σ = 74222848. Its totient is φ = 53747712.

The previous prime is 63819881. The next prime is 63819901. The reversal of 63819889 is 98891836.

It is a 8-Lehmer number, since φ(63819889) divides (63819889-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 63819889 - 2³ = 63819881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63819881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130804 + ... + 131290.

It is an arithmetic number, because the mean of its divisors is an integer number (4638928).

Almost surely, 2^63819889 is an apocalyptic number.

It is an amenable number.

63819889 is a deficient number, since it is larger than the sum of its proper divisors (10402959).

63819889 is a wasteful number, since it uses less digits than its factorization.

63819889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784.

The product of its digits is 746496, while the sum is 52.

The square root of 63819889 is about 7988.7351314210. The cubic root of 63819889 is about 399.6244162024.

The spelling of 63819889 in words is "sixty-three million, eight hundred nineteen thousand, eight hundred eighty-nine".