28193888 has 24 divisors (see below), whose sum is σ = 58772952. Its totient is φ = 13267456.

The previous prime is 28193857. The next prime is 28193927. The reversal of 28193888 is 88839182.

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 3 ways as a sum of consecutive naturals, for example, 25370 + ... + 26457.

It is an arithmetic number, because the mean of its divisors is an integer number (2448873).

Almost surely, 2^28193888 is an apocalyptic number.

It is an amenable number.

28193888 is an abundant number, since it is smaller than the sum of its proper divisors (30579064).

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

28193888 is a wasteful number, since it uses less digits than its factorization.

28193888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51854 (or 51846 counting only the distinct ones).

The product of its digits is 221184, while the sum is 47.

The square root of 28193888 is about 5309.7917096624. The cubic root of 28193888 is about 304.3581881405.

The spelling of 28193888 in words is "twenty-eight million, one hundred ninety-three thousand, eight hundred eighty-eight".