28808286 has 32 divisors (see below), whose sum is σ = 62324640. Its totient is φ = 8824704.

The previous prime is 28808261. The next prime is 28808293. The reversal of 28808286 is 68280882.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20296 + ... + 21668.

It is an arithmetic number, because the mean of its divisors is an integer number (1947645).

Almost surely, 2^28808286 is an apocalyptic number.

28808286 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28808286 is an abundant number, since it is smaller than the sum of its proper divisors (33516354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28808286 is a wasteful number, since it uses less digits than its factorization.

28808286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660.

The product of its (nonzero) digits is 98304, while the sum is 42.

The square root of 28808286 is about 5367.3350929488. The cubic root of 28808286 is about 306.5531666199.

The spelling of 28808286 in words is "twenty-eight million, eight hundred eight thousand, two hundred eighty-six".