28949816 has 24 divisors (see below), whose sum is σ = 62121720. Its totient is φ = 12389808.

The previous prime is 28949779. The next prime is 28949857. The reversal of 28949816 is 61894982.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39905 + ... + 40623.

It is an arithmetic number, because the mean of its divisors is an integer number (2588405).

Almost surely, 2^28949816 is an apocalyptic number.

It is an amenable number.

28949816 is an abundant number, since it is smaller than the sum of its proper divisors (33171904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28949816 is an frugal number, since it uses more digits than its factorization.

28949816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451 (or 728 counting only the distinct ones).

The product of its digits is 248832, while the sum is 47.

The square root of 28949816 is about 5380.5033221809. The cubic root of 28949816 is about 307.0543605351.

It can be divided in two parts, 289 and 49816, that added together give a palindrome (50105).

The spelling of 28949816 in words is "twenty-eight million, nine hundred forty-nine thousand, eight hundred sixteen".