28799091 has 32 divisors (see below), whose sum is σ = 44029440. Its totient is φ = 18597600.

The previous prime is 28799083. The next prime is 28799101. The reversal of 28799091 is 19099782.

It is not a de Polignac number, because 28799091 - 2³ = 28799083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28799051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159021 + ... + 159201.

It is an arithmetic number, because the mean of its divisors is an integer number (1375920).

Almost surely, 2^28799091 is an apocalyptic number.

28799091 is a deficient number, since it is larger than the sum of its proper divisors (15230349).

28799091 is a wasteful number, since it uses less digits than its factorization.

28799091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 28799091 is about 5366.4784542566. The cubic root of 28799091 is about 306.5205480380.

The spelling of 28799091 in words is "twenty-eight million, seven hundred ninety-nine thousand, ninety-one".