28118949 has 8 divisors (see below), whose sum is σ = 39122112. Its totient is φ = 17930880.

The previous prime is 28118939. The next prime is 28118963. The reversal of 28118949 is 94981182.

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

It is not a de Polignac number, because 28118949 - 2⁴ = 28118933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28118949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28118939) 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, 203692 + ... + 203829.

It is an arithmetic number, because the mean of its divisors is an integer number (4890264).

Almost surely, 2^28118949 is an apocalyptic number.

It is an amenable number.

28118949 is a deficient number, since it is larger than the sum of its proper divisors (11003163).

28118949 is a wasteful number, since it uses less digits than its factorization.

28118949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407547.

The product of its digits is 41472, while the sum is 42.

The square root of 28118949 is about 5302.7303344598. The cubic root of 28118949 is about 304.0882887897.

The spelling of 28118949 in words is "twenty-eight million, one hundred eighteen thousand, nine hundred forty-nine".