28927889 has 8 divisors (see below), whose sum is σ = 29693568. Its totient is φ = 28168560.

The previous prime is 28927883. The next prime is 28927901. The reversal of 28927889 is 98872982.

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

It is a cyclic number.

It is not a de Polignac number, because 28927889 - 2¹² = 28923793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28927889.

It is not an unprimeable number, because it can be changed into a prime (28927883) 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, 8459 + ... + 11375.

It is an arithmetic number, because the mean of its divisors is an integer number (3711696).

Almost surely, 2^28927889 is an apocalyptic number.

It is an amenable number.

28927889 is a deficient number, since it is larger than the sum of its proper divisors (765679).

28927889 is a wasteful number, since it uses less digits than its factorization.

28927889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3175.

The product of its digits is 1161216, while the sum is 53.

The square root of 28927889 is about 5378.4653015521. The cubic root of 28927889 is about 306.9768185165.

It can be divided in two parts, 289 and 27889, that multiplied together give a square (8059921 = 2839²).

The spelling of 28927889 in words is "twenty-eight million, nine hundred twenty-seven thousand, eight hundred eighty-nine".