28808291 has 4 divisors (see below), whose sum is σ = 28823784. Its totient is φ = 28792800.

The previous prime is 28808261. The next prime is 28808293. The reversal of 28808291 is 19280882.

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 28808291 - 2¹⁴ = 28791907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28808293) 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, 4505 + ... + 8826.

It is an arithmetic number, because the mean of its divisors is an integer number (7205946).

Almost surely, 2^28808291 is an apocalyptic number.

28808291 is a deficient number, since it is larger than the sum of its proper divisors (15493).

28808291 is a wasteful number, since it uses less digits than its factorization.

28808291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15492.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 28808291 is about 5367.3355587293. The cubic root of 28808291 is about 306.5531843552.

The spelling of 28808291 in words is "twenty-eight million, eight hundred eight thousand, two hundred ninety-one".