28018878 has 8 divisors (see below), whose sum is σ = 56037768. Its totient is φ = 9339624.

The previous prime is 28018877. The next prime is 28018883. The reversal of 28018878 is 87881082.

It is a happy number.

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

28018878 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28018871) 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, 2334901 + ... + 2334912.

It is an arithmetic number, because the mean of its divisors is an integer number (7004721).

Almost surely, 2^28018878 is an apocalyptic number.

28018878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28018878 is a wasteful number, since it uses less digits than its factorization.

28018878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4669818.

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 28018878 is about 5293.2861248944. The cubic root of 28018878 is about 303.7271255785.

The spelling of 28018878 in words is "twenty-eight million, eighteen thousand, eight hundred seventy-eight".