28118031 has 8 divisors (see below), whose sum is σ = 37624320. Its totient is φ = 18678552.

The previous prime is 28118003. The next prime is 28118033. The reversal of 28118031 is 13081182.

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

It is not a de Polignac number, because 28118031 - 2⁹ = 28117519 is a prime.

It is a super-2 number, since 2×28118031² = 1581247334633922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28117992 and 28118010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28118033) 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, 15711 + ... + 17408.

It is an arithmetic number, because the mean of its divisors is an integer number (4703040).

Almost surely, 2^28118031 is an apocalyptic number.

28118031 is a deficient number, since it is larger than the sum of its proper divisors (9506289).

28118031 is a wasteful number, since it uses less digits than its factorization.

28118031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33405.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 28118031 is about 5302.6437745713. The cubic root of 28118031 is about 304.0849795611.

The spelling of 28118031 in words is "twenty-eight million, one hundred eighteen thousand, thirty-one".