28091928 has 16 divisors (see below), whose sum is σ = 70229880. Its totient is φ = 9363968.

The previous prime is 28091927. The next prime is 28091941. The reversal of 28091928 is 82919082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28091927) by changing a digit.

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, 585225 + ... + 585272.

Almost surely, 2^28091928 is an apocalyptic number.

It is an amenable number.

28091928 is an abundant number, since it is smaller than the sum of its proper divisors (42137952).

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

28091928 is a wasteful number, since it uses less digits than its factorization.

28091928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170506 (or 1170502 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 28091928 is about 5300.1818836715. The cubic root of 28091928 is about 303.9908526795.

The spelling of 28091928 in words is "twenty-eight million, ninety-one thousand, nine hundred twenty-eight".