28662881 has 8 divisors (see below), whose sum is σ = 30938880. Its totient is φ = 26397072.

The previous prime is 28662869. The next prime is 28662883. The reversal of 28662881 is 18826682.

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

It is a de Polignac number, because none of the positive numbers 2^k-28662881 is a prime.

It is a super-2 number, since 2×28662881² = 1643121494440322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28662883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3926 + ... + 8528.

It is an arithmetic number, because the mean of its divisors is an integer number (3867360).

Almost surely, 2^28662881 is an apocalyptic number.

It is an amenable number.

28662881 is a deficient number, since it is larger than the sum of its proper divisors (2275999).

28662881 is a wasteful number, since it uses less digits than its factorization.

28662881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5095.

The product of its digits is 73728, while the sum is 41.

The square root of 28662881 is about 5353.7725950959. The cubic root of 28662881 is about 306.0365378501.

The spelling of 28662881 in words is "twenty-eight million, six hundred sixty-two thousand, eight hundred eighty-one".