28948091 has 4 divisors (see below), whose sum is σ = 29654184. Its totient is φ = 28242000.

The previous prime is 28948069. The next prime is 28948103. The reversal of 28948091 is 19084982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28948091 - 2⁶ = 28948027 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 706051 = 28948091 / (2 + 8 + 9 + 4 + 8 + 0 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28948021) 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 3 ways as a sum of consecutive naturals, for example, 352985 + ... + 353066.

It is an arithmetic number, because the mean of its divisors is an integer number (7413546).

Almost surely, 2^28948091 is an apocalyptic number.

28948091 is a deficient number, since it is larger than the sum of its proper divisors (706093).

28948091 is an equidigital number, since it uses as much as digits as its factorization.

28948091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706092.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 28948091 is about 5380.3430188047. The cubic root of 28948091 is about 307.0482617135.

The spelling of 28948091 in words is "twenty-eight million, nine hundred forty-eight thousand, ninety-one".