28027878 has 16 divisors (see below), whose sum is σ = 56182896. Its totient is φ = 9321440.

The previous prime is 28027877. The next prime is 28027897. The reversal of 28027878 is 87872082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28027877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2301 + ... + 7832.

It is an arithmetic number, because the mean of its divisors is an integer number (3511431).

Almost surely, 2^28027878 is an apocalyptic number.

28027878 is an abundant number, since it is smaller than the sum of its proper divisors (28155018).

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

28027878 is a wasteful number, since it uses less digits than its factorization.

28027878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10599.

The product of its (nonzero) digits is 100352, while the sum is 42.

The square root of 28027878 is about 5294.1361901636. The cubic root of 28027878 is about 303.7596423636.

The spelling of 28027878 in words is "twenty-eight million, twenty-seven thousand, eight hundred seventy-eight".