28689878 has 32 divisors (see below), whose sum is σ = 51770880. Its totient is φ = 11658240.

The previous prime is 28689851. The next prime is 28689889. The reversal of 28689878 is 87898682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44438 + ... + 45078.

It is an arithmetic number, because the mean of its divisors is an integer number (1617840).

Almost surely, 2^28689878 is an apocalyptic number.

28689878 is a deficient number, since it is larger than the sum of its proper divisors (23081002).

28689878 is a wasteful number, since it uses less digits than its factorization.

28689878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812.

The product of its digits is 3096576, while the sum is 56.

The square root of 28689878 is about 5356.2933078763. The cubic root of 28689878 is about 306.1325909511.

The spelling of 28689878 in words is "twenty-eight million, six hundred eighty-nine thousand, eight hundred seventy-eight".