28941091 has 4 divisors (see below), whose sum is σ = 29348784. Its totient is φ = 28533400.

The previous prime is 28941041. The next prime is 28941103. The reversal of 28941091 is 19014982.

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 28941091 - 2⁷ = 28940963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28941001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203740 + ... + 203881.

It is an arithmetic number, because the mean of its divisors is an integer number (7337196).

Almost surely, 2^28941091 is an apocalyptic number.

28941091 is a deficient number, since it is larger than the sum of its proper divisors (407693).

28941091 is an equidigital number, since it uses as much as digits as its factorization.

28941091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407692.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 28941091 is about 5379.6924633291. The cubic root of 28941091 is about 307.0235103853.

The spelling of 28941091 in words is "twenty-eight million, nine hundred forty-one thousand, ninety-one".