28115406 has 48 divisors (see below), whose sum is σ = 66970800. Its totient is φ = 8453760.

The previous prime is 28115377. The next prime is 28115429. The reversal of 28115406 is 60451182.

It is a self number, because there is not a number n which added to its sum of digits gives 28115406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29026 + ... + 29978.

It is an arithmetic number, because the mean of its divisors is an integer number (1395225).

Almost surely, 2^28115406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28115406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33485400).

28115406 is an abundant number, since it is smaller than the sum of its proper divisors (38855394).

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

28115406 is a wasteful number, since it uses less digits than its factorization.

28115406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121 (or 1118 counting only the distinct ones).

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

The square root of 28115406 is about 5302.3962507530. The cubic root of 28115406 is about 304.0755165003.

Adding to 28115406 its reverse (60451182), we get a palindrome (88566588).

The spelling of 28115406 in words is "twenty-eight million, one hundred fifteen thousand, four hundred six".