28778298 has 8 divisors (see below), whose sum is σ = 57556608. Its totient is φ = 9592764.

The previous prime is 28778273. The next prime is 28778329. The reversal of 28778298 is 89287782.

It is a happy number.

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

28778298 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 28778298.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2398186 + ... + 2398197.

It is an arithmetic number, because the mean of its divisors is an integer number (7194576).

Almost surely, 2^28778298 is an apocalyptic number.

28778298 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.

28778298 is a wasteful number, since it uses less digits than its factorization.

28778298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4796388.

The product of its digits is 903168, while the sum is 51.

The square root of 28778298 is about 5364.5408004786. The cubic root of 28778298 is about 306.4467607986.

It can be divided in two parts, 2877 and 8298, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 28778298 in words is "twenty-eight million, seven hundred seventy-eight thousand, two hundred ninety-eight".