28820878 has 8 divisors (see below), whose sum is σ = 43635672. Its totient is φ = 14275656.

The previous prime is 28820873. The next prime is 28820881. The reversal of 28820878 is 87802882.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28820873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67125 + ... + 67552.

It is an arithmetic number, because the mean of its divisors is an integer number (5454459).

Almost surely, 2^28820878 is an apocalyptic number.

28820878 is a deficient number, since it is larger than the sum of its proper divisors (14814794).

28820878 is a wasteful number, since it uses less digits than its factorization.

28820878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134786.

The product of its (nonzero) digits is 114688, while the sum is 43.

The square root of 28820878 is about 5368.5079863962. The cubic root of 28820878 is about 306.5978245492.

The spelling of 28820878 in words is "twenty-eight million, eight hundred twenty thousand, eight hundred seventy-eight".