28121118 has 16 divisors (see below), whose sum is σ = 56347920. Its totient is φ = 9356096.

The previous prime is 28121117. The next prime is 28121129. The reversal of 28121118 is 81112182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28121113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 705 + ... + 7532.

It is an arithmetic number, because the mean of its divisors is an integer number (3521745).

Almost surely, 2^28121118 is an apocalyptic number.

28121118 is an abundant number, since it is smaller than the sum of its proper divisors (28226802).

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

28121118 is a wasteful number, since it uses less digits than its factorization.

28121118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8811.

The product of its digits is 256, while the sum is 24.

The square root of 28121118 is about 5302.9348477989. The cubic root of 28121118 is about 304.0961073671.

The spelling of 28121118 in words is "twenty-eight million, one hundred twenty-one thousand, one hundred eighteen".