28865789 has 4 divisors (see below), whose sum is σ = 28995456. Its totient is φ = 28736124.

The previous prime is 28865773. The next prime is 28865791. The reversal of 28865789 is 98756882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28865789 - 2⁴ = 28865773 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 28865789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28864789) 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, 64499 + ... + 64944.

It is an arithmetic number, because the mean of its divisors is an integer number (7248864).

Almost surely, 2^28865789 is an apocalyptic number.

It is an amenable number.

28865789 is a deficient number, since it is larger than the sum of its proper divisors (129667).

28865789 is a wasteful number, since it uses less digits than its factorization.

28865789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129666.

The product of its digits is 1935360, while the sum is 53.

The square root of 28865789 is about 5372.6891776837. The cubic root of 28865789 is about 306.7569969933.

The spelling of 28865789 in words is "twenty-eight million, eight hundred sixty-five thousand, seven hundred eighty-nine".