28778368 has 16 divisors (see below), whose sum is σ = 57332160. Its totient is φ = 14389120.

The previous prime is 28778329. The next prime is 28778381. The reversal of 28778368 is 86387782.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

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 as a sum of consecutive naturals, namely, 112288 + ... + 112543.

It is an arithmetic number, because the mean of its divisors is an integer number (3583260).

Almost surely, 2^28778368 is an apocalyptic number.

It is an amenable number.

28778368 is a deficient number, since it is larger than the sum of its proper divisors (28553792).

28778368 is an equidigital number, since it uses as much as digits as its factorization.

28778368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224845 (or 224833 counting only the distinct ones).

The product of its digits is 903168, while the sum is 49.

The square root of 28778368 is about 5364.5473247982. The cubic root of 28778368 is about 306.4470092643.

The spelling of 28778368 in words is "twenty-eight million, seven hundred seventy-eight thousand, three hundred sixty-eight".