28744881 has 12 divisors (see below), whose sum is σ = 42128016. Its totient is φ = 17420920.

The previous prime is 28744879. The next prime is 28744889. The reversal of 28744881 is 18844782.

It is not a de Polignac number, because 28744881 - 2¹ = 28744879 is a prime.

It is a super-2 number, since 2×28744881² = 1652536367408322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28744889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39231 + ... + 39956.

It is an arithmetic number, because the mean of its divisors is an integer number (3510668).

Almost surely, 2^28744881 is an apocalyptic number.

It is an amenable number.

28744881 is a deficient number, since it is larger than the sum of its proper divisors (13383135).

28744881 is a wasteful number, since it uses less digits than its factorization.

28744881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79212 (or 79201 counting only the distinct ones).

The product of its digits is 114688, while the sum is 42.

The square root of 28744881 is about 5361.4252769203. The cubic root of 28744881 is about 306.3281008083.

Subtracting from 28744881 its reverse (18844782), we obtain a palindrome (9900099).

The spelling of 28744881 in words is "twenty-eight million, seven hundred forty-four thousand, eight hundred eighty-one".