28018938 has 8 divisors (see below), whose sum is σ = 56037888. Its totient is φ = 9339644.

The previous prime is 28018937. The next prime is 28018957. The reversal of 28018938 is 83981082.

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

28018938 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 28018896 and 28018905.

It is not an unprimeable number, because it can be changed into a prime (28018937) 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, 2334906 + ... + 2334917.

It is an arithmetic number, because the mean of its divisors is an integer number (7004736).

Almost surely, 2^28018938 is an apocalyptic number.

28018938 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.

28018938 is a wasteful number, since it uses less digits than its factorization.

28018938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4669828.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 28018938 is about 5293.2917924482. The cubic root of 28018938 is about 303.7273423801.

The spelling of 28018938 in words is "twenty-eight million, eighteen thousand, nine hundred thirty-eight".