28118157 has 8 divisors (see below), whose sum is σ = 39464160. Its totient is φ = 17758800.

The previous prime is 28118149. The next prime is 28118183. The reversal of 28118157 is 75181182.

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

It is not a de Polignac number, because 28118157 - 2³ = 28118149 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28118107) 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, 246594 + ... + 246707.

It is an arithmetic number, because the mean of its divisors is an integer number (4933020).

Almost surely, 2^28118157 is an apocalyptic number.

It is an amenable number.

28118157 is a deficient number, since it is larger than the sum of its proper divisors (11346003).

28118157 is a wasteful number, since it uses less digits than its factorization.

28118157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493323.

The product of its digits is 4480, while the sum is 33.

The square root of 28118157 is about 5302.6556554240. The cubic root of 28118157 is about 304.0854337732.

The spelling of 28118157 in words is "twenty-eight million, one hundred eighteen thousand, one hundred fifty-seven".