28118844 has 36 divisors (see below), whose sum is σ = 76547016. Its totient is φ = 8651808.

The previous prime is 28118821. The next prime is 28118933. The reversal of 28118844 is 44881182.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28118799 and 28118808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29574 + ... + 30509.

It is an arithmetic number, because the mean of its divisors is an integer number (2126306).

Almost surely, 2^28118844 is an apocalyptic number.

It is an amenable number.

28118844 is an abundant number, since it is smaller than the sum of its proper divisors (48428172).

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

28118844 is a wasteful number, since it uses less digits than its factorization.

28118844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60106 (or 60101 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 28118844 is about 5302.7204338905. The cubic root of 28118844 is about 304.0879102868.

The spelling of 28118844 in words is "twenty-eight million, one hundred eighteen thousand, eight hundred forty-four".