28115304 has 64 divisors (see below), whose sum is σ = 81095040. Its totient is φ = 7956480.

The previous prime is 28115303. The next prime is 28115309. The reversal of 28115304 is 40351182.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (28115303) 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, 18244 + ... + 19724.

It is an arithmetic number, because the mean of its divisors is an integer number (1267110).

Almost surely, 2^28115304 is an apocalyptic number.

28115304 is a gapful number since it is divisible by the number (24) 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 28115304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40547520).

28115304 is an abundant number, since it is smaller than the sum of its proper divisors (52979736).

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

28115304 is a wasteful number, since it uses less digits than its factorization.

28115304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610 (or 1606 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 28115304 is about 5302.3866324515. The cubic root of 28115304 is about 304.0751487809.

Adding to 28115304 its reverse (40351182), we get a palindrome (68466486).

The spelling of 28115304 in words is "twenty-eight million, one hundred fifteen thousand, three hundred four".