28997808 has 60 divisors (see below), whose sum is σ = 87148440. Its totient is φ = 8284416.

The previous prime is 28997797. The next prime is 28997833. The reversal of 28997808 is 80879982.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3813 + ... + 8516.

It is an arithmetic number, because the mean of its divisors is an integer number (1452474).

Almost surely, 2^28997808 is an apocalyptic number.

28997808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28997808 is an abundant number, since it is smaller than the sum of its proper divisors (58150632).

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

28997808 is a wasteful number, since it uses less digits than its factorization.

28997808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12354 (or 12341 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 51.

The square root of 28997808 is about 5384.9612811979. The cubic root of 28997808 is about 307.2239415477.

The spelling of 28997808 in words is "twenty-eight million, nine hundred ninety-seven thousand, eight hundred eight".