28218768 has 20 divisors (see below), whose sum is σ = 72898608. Its totient is φ = 9406240.

The previous prime is 28218767. The next prime is 28218787. The reversal of 28218768 is 86781282.

It is not an unprimeable number, because it can be changed into a prime (28218761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293898 + ... + 293993.

Almost surely, 2^28218768 is an apocalyptic number.

It is an amenable number.

28218768 is an abundant number, since it is smaller than the sum of its proper divisors (44679840).

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

28218768 is a wasteful number, since it uses less digits than its factorization.

28218768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587902 (or 587896 counting only the distinct ones).

The product of its digits is 86016, while the sum is 42.

The square root of 28218768 is about 5312.1340344536. The cubic root of 28218768 is about 304.4476898717.

The spelling of 28218768 in words is "twenty-eight million, two hundred eighteen thousand, seven hundred sixty-eight".