28155878 has 8 divisors (see below), whose sum is σ = 42285672. Its totient is φ = 14060656.

The previous prime is 28155877. The next prime is 28155901. The reversal of 28155878 is 87855182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28155877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6500 + ... + 9927.

It is an arithmetic number, because the mean of its divisors is an integer number (5285709).

Almost surely, 2^28155878 is an apocalyptic number.

28155878 is a deficient number, since it is larger than the sum of its proper divisors (14129794).

28155878 is a wasteful number, since it uses less digits than its factorization.

28155878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17286.

The product of its digits is 179200, while the sum is 44.

The square root of 28155878 is about 5306.2112660542. The cubic root of 28155878 is about 304.2213516573.

The spelling of 28155878 in words is "twenty-eight million, one hundred fifty-five thousand, eight hundred seventy-eight".