28423928 has 32 divisors (see below), whose sum is σ = 57635760. Its totient is φ = 13063680.

The previous prime is 28423921. The next prime is 28423961. The reversal of 28423928 is 82932482.

It is a junction number, because it is equal to n+sod(n) for n = 28423891 and 28423900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28423921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34643 + ... + 35453.

Almost surely, 2^28423928 is an apocalyptic number.

It is an amenable number.

28423928 is an abundant number, since it is smaller than the sum of its proper divisors (29211832).

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

28423928 is a wasteful number, since it uses less digits than its factorization.

28423928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167 (or 1163 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 28423928 is about 5331.4095697104. The cubic root of 28423928 is about 305.1837216133.

The spelling of 28423928 in words is "twenty-eight million, four hundred twenty-three thousand, nine hundred twenty-eight".