28318290 has 256 divisors, whose sum is σ = 97542144. Its totient is φ = 5068800.

The previous prime is 28318253. The next prime is 28318291. The reversal of 28318290 is 9281382.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28318291) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 690670 + ... + 690710.

It is an arithmetic number, because the mean of its divisors is an integer number (381024).

Almost surely, 2^28318290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28318290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48771072).

28318290 is an abundant number, since it is smaller than the sum of its proper divisors (69223854).

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

28318290 is a wasteful number, since it uses less digits than its factorization.

28318290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 28318290 is about 5321.4932114962. The cubic root of 28318290 is about 304.8051788168.

The spelling of 28318290 in words is "twenty-eight million, three hundred eighteen thousand, two hundred ninety".