28851389 has 8 divisors (see below), whose sum is σ = 33313728. Its totient is φ = 24474240.

The previous prime is 28851371. The next prime is 28851391. The reversal of 28851389 is 98315882.

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

It is not a de Polignac number, because 28851389 - 2¹⁶ = 28785853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28851349) 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, 20567 + ... + 21924.

It is an arithmetic number, because the mean of its divisors is an integer number (4164216).

Almost surely, 2^28851389 is an apocalyptic number.

It is an amenable number.

28851389 is a deficient number, since it is larger than the sum of its proper divisors (4462339).

28851389 is an equidigital number, since it uses as much as digits as its factorization.

28851389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42595.

The product of its digits is 138240, while the sum is 44.

The square root of 28851389 is about 5371.3488994851. The cubic root of 28851389 is about 306.7059788660.

The spelling of 28851389 in words is "twenty-eight million, eight hundred fifty-one thousand, three hundred eighty-nine".