28243880 has 64 divisors (see below), whose sum is σ = 76464000. Its totient is φ = 9172224.

The previous prime is 28243879. The next prime is 28243903. The reversal of 28243880 is 8834282.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 28243880.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2666 + ... + 7974.

It is an arithmetic number, because the mean of its divisors is an integer number (1194750).

Almost surely, 2^28243880 is an apocalyptic number.

28243880 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 28243880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38232000).

28243880 is an abundant number, since it is smaller than the sum of its proper divisors (48220120).

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

28243880 is a wasteful number, since it uses less digits than its factorization.

28243880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5346 (or 5342 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 28243880 is about 5314.4971540118. The cubic root of 28243880 is about 304.5379728547.

The spelling of 28243880 in words is "twenty-eight million, two hundred forty-three thousand, eight hundred eighty".