28091983 has 8 divisors (see below), whose sum is σ = 29095040. Its totient is φ = 27095040.

The previous prime is 28091977. The next prime is 28092023. The reversal of 28091983 is 38919082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28091983 - 2⁹ = 28091471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28091953) 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, 9103 + ... + 11791.

It is an arithmetic number, because the mean of its divisors is an integer number (3636880).

Almost surely, 2^28091983 is an apocalyptic number.

28091983 is a deficient number, since it is larger than the sum of its proper divisors (1003057).

28091983 is a wasteful number, since it uses less digits than its factorization.

28091983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 28091983 is about 5300.1870721702. The cubic root of 28091983 is about 303.9910510697.

The spelling of 28091983 in words is "twenty-eight million, ninety-one thousand, nine hundred eighty-three".