63889447 has 4 divisors (see below), whose sum is σ = 63971416. Its totient is φ = 63807480.

The previous prime is 63889393. The next prime is 63889453. The reversal of 63889447 is 74498836.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63889447 is a prime.

It is a super-2 number, since 2×63889447² = 8163722875931618, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63889447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63889747) 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, 39804 + ... + 41377.

It is an arithmetic number, because the mean of its divisors is an integer number (15992854).

Almost surely, 2^63889447 is an apocalyptic number.

63889447 is a deficient number, since it is larger than the sum of its proper divisors (81969).

63889447 is an equidigital number, since it uses as much as digits as its factorization.

63889447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81968.

The product of its digits is 1161216, while the sum is 49.

The square root of 63889447 is about 7993.0874510417. The cubic root of 63889447 is about 399.7695485058.

The spelling of 63889447 in words is "sixty-three million, eight hundred eighty-nine thousand, four hundred forty-seven".