28345989 has 8 divisors (see below), whose sum is σ = 43193920. Its totient is φ = 16197696.

The previous prime is 28345957. The next prime is 28345991. The reversal of 28345989 is 98954382.

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

It is not a de Polignac number, because 28345989 - 2⁵ = 28345957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28345949) 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, 674884 + ... + 674925.

It is an arithmetic number, because the mean of its divisors is an integer number (5399240).

Almost surely, 2^28345989 is an apocalyptic number.

It is an amenable number.

28345989 is a deficient number, since it is larger than the sum of its proper divisors (14847931).

28345989 is a wasteful number, since it uses less digits than its factorization.

28345989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349819.

The product of its digits is 622080, while the sum is 48.

The square root of 28345989 is about 5324.0951343867. The cubic root of 28345989 is about 304.9045262400.

The spelling of 28345989 in words is "twenty-eight million, three hundred forty-five thousand, nine hundred eighty-nine".