28363840 has 56 divisors (see below), whose sum is σ = 68104512. Its totient is φ = 11251200.

The previous prime is 28363823. The next prime is 28363849. The reversal of 28363840 is 4836382.

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 junction number, because it is equal to n+sod(n) for n = 28363796 and 28363805.

It is not an unprimeable number, because it can be changed into a prime (28363849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48027 + ... + 48613.

It is an arithmetic number, because the mean of its divisors is an integer number (1216152).

Almost surely, 2^28363840 is an apocalyptic number.

28363840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28363840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34052256).

28363840 is an abundant number, since it is smaller than the sum of its proper divisors (39740672).

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

28363840 is a wasteful number, since it uses less digits than its factorization.

28363840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755 (or 745 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 28363840 is about 5325.7713056420. The cubic root of 28363840 is about 304.9685177574.

The spelling of 28363840 in words is "twenty-eight million, three hundred sixty-three thousand, eight hundred forty".