28118508 has 24 divisors (see below), whose sum is σ = 71574720. Its totient is φ = 8520720.

The previous prime is 28118507. The next prime is 28118509. The reversal of 28118508 is 80581182.

It is an interprime number because it is at equal distance from previous prime (28118507) and next prime (28118509).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (28118507) 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, 106378 + ... + 106641.

It is an arithmetic number, because the mean of its divisors is an integer number (2982280).

Almost surely, 2^28118508 is an apocalyptic number.

It is an amenable number.

28118508 is an abundant number, since it is smaller than the sum of its proper divisors (43456212).

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

28118508 is a wasteful number, since it uses less digits than its factorization.

28118508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213037 (or 213035 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 28118508 is about 5302.6887519446. The cubic root of 28118508 is about 304.0866990712.

The spelling of 28118508 in words is "twenty-eight million, one hundred eighteen thousand, five hundred eight".