28393736 has 48 divisors (see below), whose sum is σ = 62575740. Its totient is φ = 12042240.

The previous prime is 28393721. The next prime is 28393769. The reversal of 28393736 is 63739382.

It can be written as a sum of positive squares in 2 ways, for example, as 28153636 + 240100 = 5306^2 + 490^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28393693 and 28393702.

It is a congruent 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, 43976 + ... + 44616.

Almost surely, 2^28393736 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 28393736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31287870).

28393736 is an abundant number, since it is smaller than the sum of its proper divisors (34182004).

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

28393736 is a wasteful number, since it uses less digits than its factorization.

28393736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774 (or 763 counting only the distinct ones).

The product of its digits is 163296, while the sum is 41.

The square root of 28393736 is about 5328.5772960519. The cubic root of 28393736 is about 305.0756275775.

The spelling of 28393736 in words is "twenty-eight million, three hundred ninety-three thousand, seven hundred thirty-six".