28023928 has 16 divisors (see below), whose sum is σ = 52660080. Its totient is φ = 13981248.

The previous prime is 28023923. The next prime is 28023943. The reversal of 28023928 is 82932082.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28023893 and 28023902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28023923) 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, 300 + ... + 7492.

It is an arithmetic number, because the mean of its divisors is an integer number (3291255).

Almost surely, 2^28023928 is an apocalyptic number.

It is an amenable number.

28023928 is a deficient number, since it is larger than the sum of its proper divisors (24636152).

28023928 is a wasteful number, since it uses less digits than its factorization.

28023928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7686 (or 7682 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 28023928 is about 5293.7631227700. The cubic root of 28023928 is about 303.7453719651.

The spelling of 28023928 in words is "twenty-eight million, twenty-three thousand, nine hundred twenty-eight".