28868091 has 16 divisors (see below), whose sum is σ = 46577664. Its totient is φ = 15525504.

The previous prime is 28868083. The next prime is 28868107. The reversal of 28868091 is 19086882.

It is not a de Polignac number, because 28868091 - 2³ = 28868083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28868041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40075 + ... + 40788.

It is an arithmetic number, because the mean of its divisors is an integer number (2911104).

Almost surely, 2^28868091 is an apocalyptic number.

28868091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28868091 is a deficient number, since it is larger than the sum of its proper divisors (17709573).

28868091 is a wasteful number, since it uses less digits than its factorization.

28868091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80890.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 28868091 is about 5372.9034050502. The cubic root of 28868091 is about 306.7651512347.

The spelling of 28868091 in words is "twenty-eight million, eight hundred sixty-eight thousand, ninety-one".