28214878 has 4 divisors (see below), whose sum is σ = 42322320. Its totient is φ = 14107438.

The previous prime is 28214873. The next prime is 28214933. The reversal of 28214878 is 87841282.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28214878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28214873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7053718 + ... + 7053721.

It is an arithmetic number, because the mean of its divisors is an integer number (10580580).

Almost surely, 2^28214878 is an apocalyptic number.

28214878 is a deficient number, since it is larger than the sum of its proper divisors (14107442).

28214878 is a wasteful number, since it uses less digits than its factorization.

28214878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14107441.

The product of its digits is 57344, while the sum is 40.

The square root of 28214878 is about 5311.7678789646. The cubic root of 28214878 is about 304.4336997035.

It can be divided in two parts, 28214 and 878, that added together give a palindrome (29092).

The spelling of 28214878 in words is "twenty-eight million, two hundred fourteen thousand, eight hundred seventy-eight".