28086993 has 40 divisors (see below), whose sum is σ = 47393280. Its totient is φ = 16420320.

The previous prime is 28086991. The next prime is 28087001. The reversal of 28086993 is 39968082.

It is not a de Polignac number, because 28086993 - 2¹ = 28086991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28086991) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 25296 + ... + 26382.

It is an arithmetic number, because the mean of its divisors is an integer number (1184832).

Almost surely, 2^28086993 is an apocalyptic number.

It is an amenable number.

28086993 is a deficient number, since it is larger than the sum of its proper divisors (19306287).

28086993 is a wasteful number, since it uses less digits than its factorization.

28086993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139 (or 1130 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 28086993 is about 5299.7163131624. The cubic root of 28086993 is about 303.9730506177.

It can be divided in two parts, 2808 and 6993, that added together give a square (9801 = 99²).

The spelling of 28086993 in words is "twenty-eight million, eighty-six thousand, nine hundred ninety-three".