28123316 has 24 divisors (see below), whose sum is σ = 53178720. Its totient is φ = 12936672.

The previous prime is 28123283. The next prime is 28123339. The reversal of 28123316 is 61332182.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18995 + ... + 20421.

It is an arithmetic number, because the mean of its divisors is an integer number (2215780).

Almost surely, 2^28123316 is an apocalyptic number.

28123316 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28123316 is a deficient number, since it is larger than the sum of its proper divisors (25055404).

28123316 is a wasteful number, since it uses less digits than its factorization.

28123316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823 (or 1821 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 28123316 is about 5303.1420874798. The cubic root of 28123316 is about 304.1040300705.

Adding to 28123316 its reverse (61332182), we get a palindrome (89455498).

The spelling of 28123316 in words is "twenty-eight million, one hundred twenty-three thousand, three hundred sixteen".