28378789 has 8 divisors (see below), whose sum is σ = 28766912. Its totient is φ = 27993600.

The previous prime is 28378787. The next prime is 28378817. The reversal of 28378789 is 98787382.

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 28378789 - 2¹ = 28378787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28378781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24037 + ... + 25189.

It is an arithmetic number, because the mean of its divisors is an integer number (3595864).

Almost surely, 2^28378789 is an apocalyptic number.

It is an amenable number.

28378789 is a deficient number, since it is larger than the sum of its proper divisors (388123).

28378789 is a wasteful number, since it uses less digits than its factorization.

28378789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467.

The product of its digits is 1354752, while the sum is 52.

The square root of 28378789 is about 5327.1745794558. The cubic root of 28378789 is about 305.0220856532.

The spelling of 28378789 in words is "twenty-eight million, three hundred seventy-eight thousand, seven hundred eighty-nine".