28867784 has 16 divisors (see below), whose sum is σ = 59047920. Its totient is φ = 13121680.

The previous prime is 28867763. The next prime is 28867793. The reversal of 28867784 is 48776882.

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 3 ways as a sum of consecutive naturals, for example, 163934 + ... + 164109.

It is an arithmetic number, because the mean of its divisors is an integer number (3690495).

Almost surely, 2^28867784 is an apocalyptic number.

It is an amenable number.

28867784 is an abundant number, since it is smaller than the sum of its proper divisors (30180136).

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

28867784 is a wasteful number, since it uses less digits than its factorization.

28867784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328060 (or 328056 counting only the distinct ones).

The product of its digits is 1204224, while the sum is 50.

The square root of 28867784 is about 5372.8748356909. The cubic root of 28867784 is about 306.7640637915.

The spelling of 28867784 in words is "twenty-eight million, eight hundred sixty-seven thousand, seven hundred eighty-four".