28808057 has 4 divisors (see below), whose sum is σ = 29238096. Its totient is φ = 28378020.

The previous prime is 28808051. The next prime is 28808071. The reversal of 28808057 is 75080882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28808057 - 2⁶ = 28807993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28808057.

It is not an unprimeable number, because it can be changed into a prime (28808051) 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, 214919 + ... + 215052.

It is an arithmetic number, because the mean of its divisors is an integer number (7309524).

Almost surely, 2^28808057 is an apocalyptic number.

It is an amenable number.

28808057 is a deficient number, since it is larger than the sum of its proper divisors (430039).

28808057 is an equidigital number, since it uses as much as digits as its factorization.

28808057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430038.

The product of its (nonzero) digits is 35840, while the sum is 38.

The square root of 28808057 is about 5367.3137601597. The cubic root of 28808057 is about 306.5523543437.

The spelling of 28808057 in words is "twenty-eight million, eight hundred eight thousand, fifty-seven".