28393776 has 60 divisors (see below), whose sum is σ = 82927728. Its totient is φ = 9052032.

The previous prime is 28393769. The next prime is 28393789. The reversal of 28393776 is 67739382.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 975 + ... + 7598.

Almost surely, 2^28393776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28393776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41463864).

28393776 is an abundant number, since it is smaller than the sum of its proper divisors (54533952).

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

28393776 is a wasteful number, since it uses less digits than its factorization.

28393776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8610 (or 8601 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 28393776 is about 5328.5810493977. The cubic root of 28393776 is about 305.0757708370.

The spelling of 28393776 in words is "twenty-eight million, three hundred ninety-three thousand, seven hundred seventy-six".