28869918 has 96 divisors (see below), whose sum is σ = 74856960. Its totient is φ = 7338240.

The previous prime is 28869917. The next prime is 28869931. The reversal of 28869918 is 81996882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28869913) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 255430 + ... + 255542.

It is an arithmetic number, because the mean of its divisors is an integer number (779760).

Almost surely, 2^28869918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28869918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37428480).

28869918 is an abundant number, since it is smaller than the sum of its proper divisors (45987042).

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

28869918 is a wasteful number, since it uses less digits than its factorization.

28869918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 215 counting only the distinct ones).

The product of its digits is 497664, while the sum is 51.

The square root of 28869918 is about 5373.0734221672. The cubic root of 28869918 is about 306.7716226026.

The spelling of 28869918 in words is "twenty-eight million, eight hundred sixty-nine thousand, nine hundred eighteen".