28247778 has 96 divisors (see below), whose sum is σ = 72648576. Its totient is φ = 8149248.

The previous prime is 28247777. The next prime is 28247797. The reversal of 28247778 is 87774282.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28247771) 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 47 ways as a sum of consecutive naturals, for example, 107275 + ... + 107537.

It is an arithmetic number, because the mean of its divisors is an integer number (756756).

Almost surely, 2^28247778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28247778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36324288).

28247778 is an abundant number, since it is smaller than the sum of its proper divisors (44400798).

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

28247778 is a wasteful number, since it uses less digits than its factorization.

28247778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 298 counting only the distinct ones).

The product of its digits is 351232, while the sum is 45.

The square root of 28247778 is about 5314.8638740799. The cubic root of 28247778 is about 304.5519821954.

The spelling of 28247778 in words is "twenty-eight million, two hundred forty-seven thousand, seven hundred seventy-eight".