28496778 has 8 divisors (see below), whose sum is σ = 56993568. Its totient is φ = 9498924.

The previous prime is 28496761. The next prime is 28496779. The reversal of 28496778 is 87769482.

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

28496778 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 28496778.

It is not an unprimeable number, because it can be changed into a prime (28496779) 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 3 ways as a sum of consecutive naturals, for example, 2374726 + ... + 2374737.

It is an arithmetic number, because the mean of its divisors is an integer number (7124196).

Almost surely, 2^28496778 is an apocalyptic number.

28496778 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.

28496778 is a wasteful number, since it uses less digits than its factorization.

28496778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4749468.

The product of its digits is 1354752, while the sum is 51.

The square root of 28496778 is about 5338.2373495378. The cubic root of 28496778 is about 305.4442259224. Note that the first 3 decimals are identical.

The spelling of 28496778 in words is "twenty-eight million, four hundred ninety-six thousand, seven hundred seventy-eight".