28817788 has 12 divisors (see below), whose sum is σ = 53397792. Its totient is φ = 13561280.

The previous prime is 28817779. The next prime is 28817797. The reversal of 28817788 is 88771882.

It is an interprime number because it is at equal distance from previous prime (28817779) and next prime (28817797).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211828 + ... + 211963.

It is an arithmetic number, because the mean of its divisors is an integer number (4449816).

Almost surely, 2^28817788 is an apocalyptic number.

It is an amenable number.

28817788 is a deficient number, since it is larger than the sum of its proper divisors (24580004).

28817788 is a wasteful number, since it uses less digits than its factorization.

28817788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423812 (or 423810 counting only the distinct ones).

The product of its digits is 401408, while the sum is 49.

The square root of 28817788 is about 5368.2201892247. The cubic root of 28817788 is about 306.5868669703.

The spelling of 28817788 in words is "twenty-eight million, eight hundred seventeen thousand, seven hundred eighty-eight".