28091982 has 8 divisors (see below), whose sum is σ = 56183976. Its totient is φ = 9363992.

The previous prime is 28091977. The next prime is 28092023. The reversal of 28091982 is 28919082.

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

28091982 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 28091982.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2340993 + ... + 2341004.

It is an arithmetic number, because the mean of its divisors is an integer number (7022997).

Almost surely, 2^28091982 is an apocalyptic number.

28091982 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28091982 is a wasteful number, since it uses less digits than its factorization.

28091982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4682002.

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

The square root of 28091982 is about 5300.1869778339. The cubic root of 28091982 is about 303.9910474626.

The spelling of 28091982 in words is "twenty-eight million, ninety-one thousand, nine hundred eighty-two".