28989663 has 8 divisors (see below), whose sum is σ = 38683776. Its totient is φ = 19311000.

The previous prime is 28989661. The next prime is 28989673. The reversal of 28989663 is 36698982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28989663 - 2¹ = 28989661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28989661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1638 + ... + 7788.

It is an arithmetic number, because the mean of its divisors is an integer number (4835472).

Almost surely, 2^28989663 is an apocalyptic number.

28989663 is a deficient number, since it is larger than the sum of its proper divisors (9694113).

28989663 is a wasteful number, since it uses less digits than its factorization.

28989663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7725.

The product of its digits is 1119744, while the sum is 51.

The square root of 28989663 is about 5384.2049552371. The cubic root of 28989663 is about 307.1951741626.

It can be divided in two parts, 2898 and 9663, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 28989663 in words is "twenty-eight million, nine hundred eighty-nine thousand, six hundred sixty-three".