28207091 has 8 divisors (see below), whose sum is σ = 30969264. Its totient is φ = 25477920.

The previous prime is 28207087. The next prime is 28207099. The reversal of 28207091 is 19070282.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28207091 - 2² = 28207087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28207099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6440 + ... + 9893.

It is an arithmetic number, because the mean of its divisors is an integer number (3871158).

Almost surely, 2^28207091 is an apocalyptic number.

28207091 is a deficient number, since it is larger than the sum of its proper divisors (2762173).

28207091 is a wasteful number, since it uses less digits than its factorization.

28207091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16501.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 28207091 is about 5311.0348332505. The cubic root of 28207091 is about 304.4056903279.

The spelling of 28207091 in words is "twenty-eight million, two hundred seven thousand, ninety-one".