28969278 has 32 divisors (see below), whose sum is σ = 63286272. Its totient is φ = 8786400.

The previous prime is 28969273. The next prime is 28969301. The reversal of 28969278 is 87296982.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28969278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28969273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2923 + ... + 8153.

It is an arithmetic number, because the mean of its divisors is an integer number (1977696).

Almost surely, 2^28969278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28969278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31643136).

28969278 is an abundant number, since it is smaller than the sum of its proper divisors (34316994).

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

28969278 is a wasteful number, since it uses less digits than its factorization.

28969278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5320.

The product of its digits is 870912, while the sum is 51.

The square root of 28969278 is about 5382.3115851835. The cubic root of 28969278 is about 307.1231526054.

The spelling of 28969278 in words is "twenty-eight million, nine hundred sixty-nine thousand, two hundred seventy-eight".