28778834 has 16 divisors (see below), whose sum is σ = 49790400. Its totient is φ = 12219984.

The previous prime is 28778821. The next prime is 28778837. The reversal of 28778834 is 43887782.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28778837) 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, 7904 + ... + 10955.

It is an arithmetic number, because the mean of its divisors is an integer number (3111900).

Almost surely, 2^28778834 is an apocalyptic number.

28778834 is a deficient number, since it is larger than the sum of its proper divisors (21011566).

28778834 is a wasteful number, since it uses less digits than its factorization.

28778834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18977.

The product of its digits is 602112, while the sum is 47.

The square root of 28778834 is about 5364.5907579237. The cubic root of 28778834 is about 306.4486633254.

It can be divided in two parts, 2877 and 8834, that added together give a palindrome (11711).

The spelling of 28778834 in words is "twenty-eight million, seven hundred seventy-eight thousand, eight hundred thirty-four".