28378589 has 4 divisors (see below), whose sum is σ = 28527360. Its totient is φ = 28229820.

The previous prime is 28378579. The next prime is 28378607. The reversal of 28378589 is 98587382.

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 a de Polignac number, because none of the positive numbers 2^k-28378589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28378579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74099 + ... + 74480.

It is an arithmetic number, because the mean of its divisors is an integer number (7131840).

Almost surely, 2^28378589 is an apocalyptic number.

It is an amenable number.

28378589 is a deficient number, since it is larger than the sum of its proper divisors (148771).

28378589 is a wasteful number, since it uses less digits than its factorization.

28378589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148770.

The product of its digits is 967680, while the sum is 50.

The square root of 28378589 is about 5327.1558077458. The cubic root of 28378589 is about 305.0213691021.

The spelling of 28378589 in words is "twenty-eight million, three hundred seventy-eight thousand, five hundred eighty-nine".