28878555 has 16 divisors (see below), whose sum is σ = 47333664. Its totient is φ = 15025920.

The previous prime is 28878533. The next prime is 28878571. The reversal of 28878555 is 55587882.

It is a happy number.

It is not a de Polignac number, because 28878555 - 2¹⁰ = 28877531 is a prime.

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, 22864 + ... + 24093.

It is an arithmetic number, because the mean of its divisors is an integer number (2958354).

Almost surely, 2^28878555 is an apocalyptic number.

28878555 is a deficient number, since it is larger than the sum of its proper divisors (18455109).

28878555 is a wasteful number, since it uses less digits than its factorization.

28878555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47006.

The product of its digits is 896000, while the sum is 48.

The square root of 28878555 is about 5373.8770920072. The cubic root of 28878555 is about 306.8022117938.

The spelling of 28878555 in words is "twenty-eight million, eight hundred seventy-eight thousand, five hundred fifty-five".