28111870 has 8 divisors (see below), whose sum is σ = 50601384. Its totient is φ = 11244744.

The previous prime is 28111843. The next prime is 28111871. The reversal of 28111870 is 7811182.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28111871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1405584 + ... + 1405603.

It is an arithmetic number, because the mean of its divisors is an integer number (6325173).

Almost surely, 2^28111870 is an apocalyptic number.

28111870 is a deficient number, since it is larger than the sum of its proper divisors (22489514).

28111870 is a wasteful number, since it uses less digits than its factorization.

28111870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811194.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 28111870 is about 5302.0628061161. The cubic root of 28111870 is about 304.0627683756.

The spelling of 28111870 in words is "twenty-eight million, one hundred eleven thousand, eight hundred seventy".