28117744 has 40 divisors (see below), whose sum is σ = 56996352. Its totient is φ = 13421760.

The previous prime is 28117717. The next prime is 28117769. The reversal of 28117744 is 44771182.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40827 + ... + 41509.

Almost surely, 2^28117744 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 28117744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28498176).

28117744 is an abundant number, since it is smaller than the sum of its proper divisors (28878608).

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

28117744 is a wasteful number, since it uses less digits than its factorization.

28117744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805 (or 799 counting only the distinct ones).

The product of its digits is 12544, while the sum is 34.

The square root of 28117744 is about 5302.6167125298. The cubic root of 28117744 is about 304.0839449618.

The spelling of 28117744 in words is "twenty-eight million, one hundred seventeen thousand, seven hundred forty-four".