28389451 has 4 divisors (see below), whose sum is σ = 28426312. Its totient is φ = 28352592.

The previous prime is 28389409. The next prime is 28389467. The reversal of 28389451 is 15498382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28389451 - 2¹³ = 28381259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28386451) 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 3 ways as a sum of consecutive naturals, for example, 17250 + ... + 18823.

It is an arithmetic number, because the mean of its divisors is an integer number (7106578).

Almost surely, 2^28389451 is an apocalyptic number.

28389451 is a deficient number, since it is larger than the sum of its proper divisors (36861).

28389451 is an equidigital number, since it uses as much as digits as its factorization.

28389451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36860.

The product of its digits is 69120, while the sum is 40.

The square root of 28389451 is about 5328.1752035758. The cubic root of 28389451 is about 305.0602801217.

The spelling of 28389451 in words is "twenty-eight million, three hundred eighty-nine thousand, four hundred fifty-one".