28428789 has 8 divisors (see below), whose sum is σ = 37933792. Its totient is φ = 18938160.

The previous prime is 28428781. The next prime is 28428791. The reversal of 28428789 is 98782482.

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

It is not a de Polignac number, because 28428789 - 2³ = 28428781 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 (28428781) 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, 2502 + ... + 7944.

It is an arithmetic number, because the mean of its divisors is an integer number (4741724).

Almost surely, 2^28428789 is an apocalyptic number.

It is an amenable number.

28428789 is a deficient number, since it is larger than the sum of its proper divisors (9505003).

28428789 is a wasteful number, since it uses less digits than its factorization.

28428789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7187.

The product of its digits is 516096, while the sum is 48.

The square root of 28428789 is about 5331.8654334107. The cubic root of 28428789 is about 305.2011179130.

The spelling of 28428789 in words is "twenty-eight million, four hundred twenty-eight thousand, seven hundred eighty-nine".