28840518 has 72 divisors (see below), whose sum is σ = 76560120. Its totient is φ = 7801920.

The previous prime is 28840481. The next prime is 28840523. The reversal of 28840518 is 81504882.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 15898 + ... + 17618.

It is an arithmetic number, because the mean of its divisors is an integer number (1063335).

Almost surely, 2^28840518 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28840518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38280060).

28840518 is an abundant number, since it is smaller than the sum of its proper divisors (47719602).

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

28840518 is a wasteful number, since it uses less digits than its factorization.

28840518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762 (or 1752 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 28840518 is about 5370.3368609427. The cubic root of 28840518 is about 306.6674524765.

The spelling of 28840518 in words is "twenty-eight million, eight hundred forty thousand, five hundred eighteen".