28297816 has 32 divisors (see below), whose sum is σ = 54432000. Its totient is φ = 13787296.

The previous prime is 28297777. The next prime is 28297861. The reversal of 28297816 is 61879282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78645 + ... + 79003.

It is an arithmetic number, because the mean of its divisors is an integer number (1701000).

Almost surely, 2^28297816 is an apocalyptic number.

It is an amenable number.

28297816 is a deficient number, since it is larger than the sum of its proper divisors (26134184).

28297816 is a wasteful number, since it uses less digits than its factorization.

28297816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591 (or 587 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 28297816 is about 5319.5691554862. The cubic root of 28297816 is about 304.7317035021.

The spelling of 28297816 in words is "twenty-eight million, two hundred ninety-seven thousand, eight hundred sixteen".