28778754 has 16 divisors (see below), whose sum is σ = 57945600. Its totient is φ = 9528240.

The previous prime is 28778747. The next prime is 28778777. The reversal of 28778754 is 45787782.

It is a happy 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, 15202 + ... + 16989.

It is an arithmetic number, because the mean of its divisors is an integer number (3621600).

Almost surely, 2^28778754 is an apocalyptic number.

28778754 is an abundant number, since it is smaller than the sum of its proper divisors (29166846).

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

28778754 is a wasteful number, since it uses less digits than its factorization.

28778754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32345.

The product of its digits is 878080, while the sum is 48.

The square root of 28778754 is about 5364.5833016181. The cubic root of 28778754 is about 306.4483793677.

Subtracting 28778754 from its reverse (45787782), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 28778754 in words is "twenty-eight million, seven hundred seventy-eight thousand, seven hundred fifty-four".