28311918 has 8 divisors (see below), whose sum is σ = 56623848. Its totient is φ = 9437304.

The previous prime is 28311901. The next prime is 28311947. The reversal of 28311918 is 81911382.

It is a sphenic number, since it is the product of 3 distinct primes.

28311918 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2359321 + ... + 2359332.

It is an arithmetic number, because the mean of its divisors is an integer number (7077981).

Almost surely, 2^28311918 is an apocalyptic number.

28311918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28311918 is a wasteful number, since it uses less digits than its factorization.

28311918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4718658.

The product of its digits is 3456, while the sum is 33.

The square root of 28311918 is about 5320.8944736764. The cubic root of 28311918 is about 304.7823153330.

The spelling of 28311918 in words is "twenty-eight million, three hundred eleven thousand, nine hundred eighteen".