28778548 has 24 divisors (see below), whose sum is σ = 51559200. Its totient is φ = 14050848.

The previous prime is 28778531. The next prime is 28778551. The reversal of 28778548 is 84587782.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46183 + ... + 46801.

It is an arithmetic number, because the mean of its divisors is an integer number (2148300).

Almost surely, 2^28778548 is an apocalyptic number.

It is an amenable number.

28778548 is a deficient number, since it is larger than the sum of its proper divisors (22780652).

28778548 is a wasteful number, since it uses less digits than its factorization.

28778548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879 (or 877 counting only the distinct ones).

The product of its digits is 1003520, while the sum is 49.

The square root of 28778548 is about 5364.5641015837. The cubic root of 28778548 is about 306.4476481741.

The spelling of 28778548 in words is "twenty-eight million, seven hundred seventy-eight thousand, five hundred forty-eight".