28384451 has 4 divisors (see below), whose sum is σ = 28784304. Its totient is φ = 27984600.

The previous prime is 28384427. The next prime is 28384469. The reversal of 28384451 is 15448382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15448382 = 2 ⋅7724191.

It is a cyclic number.

It is not a de Polignac number, because 28384451 - 2⁶ = 28384387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28384471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199820 + ... + 199961.

It is an arithmetic number, because the mean of its divisors is an integer number (7196076).

Almost surely, 2^28384451 is an apocalyptic number.

28384451 is a deficient number, since it is larger than the sum of its proper divisors (399853).

28384451 is an equidigital number, since it uses as much as digits as its factorization.

28384451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399852.

The product of its digits is 30720, while the sum is 35.

The square root of 28384451 is about 5327.7059791246. The cubic root of 28384451 is about 305.0423698193.

The spelling of 28384451 in words is "twenty-eight million, three hundred eighty-four thousand, four hundred fifty-one".