28989883 has 4 divisors (see below), whose sum is σ = 31219888. Its totient is φ = 26759880.

The previous prime is 28989847. The next prime is 28989889. The reversal of 28989883 is 38898982.

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-28989883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28989889) 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, 1114983 + ... + 1115008.

It is an arithmetic number, because the mean of its divisors is an integer number (7804972).

Almost surely, 2^28989883 is an apocalyptic number.

28989883 is a deficient number, since it is larger than the sum of its proper divisors (2230005).

28989883 is a wasteful number, since it uses less digits than its factorization.

28989883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230004.

The product of its digits is 1990656, while the sum is 55.

The square root of 28989883 is about 5384.2253853270. The cubic root of 28989883 is about 307.1959512530.

Subtracting 28989883 from its reverse (38898982), we obtain a palindrome (9909099).

The spelling of 28989883 in words is "twenty-eight million, nine hundred eighty-nine thousand, eight hundred eighty-three".