28005318 has 32 divisors (see below), whose sum is σ = 67893120. Its totient is φ = 8486280.

The previous prime is 28005317. The next prime is 28005331. The reversal of 28005318 is 81350082.

It is a happy number.

It is a super-2 number, since 2×28005318² = 1568595672562248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28005291 and 28005300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28005317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22980 + ... + 24167.

It is an arithmetic number, because the mean of its divisors is an integer number (2121660).

Almost surely, 2^28005318 is an apocalyptic number.

28005318 is an abundant number, since it is smaller than the sum of its proper divisors (39887802).

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

28005318 is a wasteful number, since it uses less digits than its factorization.

28005318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47169 (or 47163 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 28005318 is about 5292.0051020384. The cubic root of 28005318 is about 303.6781204708.

It can be divided in two parts, 2800 and 5318, that added together give a palindrome (8118).

The spelling of 28005318 in words is "twenty-eight million, five thousand, three hundred eighteen".