28007091 has 12 divisors (see below), whose sum is σ = 46234032. Its totient is φ = 16004016.

The previous prime is 28007087. The next prime is 28007099. The reversal of 28007091 is 19070082.

It is not a de Polignac number, because 28007091 - 2² = 28007087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28007099) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222216 + ... + 222341.

It is an arithmetic number, because the mean of its divisors is an integer number (3852836).

Almost surely, 2^28007091 is an apocalyptic number.

28007091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28007091 is a deficient number, since it is larger than the sum of its proper divisors (18226941).

28007091 is a wasteful number, since it uses less digits than its factorization.

28007091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444570 (or 444567 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 28007091 is about 5292.1726162324. The cubic root of 28007091 is about 303.6845288958.

The spelling of 28007091 in words is "twenty-eight million, seven thousand, ninety-one".