28647389 has 8 divisors (see below), whose sum is σ = 29700000. Its totient is φ = 27599152.

The previous prime is 28647373. The next prime is 28647403. The reversal of 28647389 is 98374682.

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 28647389 - 2⁴ = 28647373 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 (28647349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18362 + ... + 19860.

It is an arithmetic number, because the mean of its divisors is an integer number (3712500).

Almost surely, 2^28647389 is an apocalyptic number.

28647389 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28647389 is a deficient number, since it is larger than the sum of its proper divisors (1052611).

28647389 is a wasteful number, since it uses less digits than its factorization.

28647389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187.

The product of its digits is 580608, while the sum is 47.

The square root of 28647389 is about 5352.3255693203. The cubic root of 28647389 is about 305.9813913528.

The spelling of 28647389 in words is "twenty-eight million, six hundred forty-seven thousand, three hundred eighty-nine".