28821451 has 2 divisors, whose sum is σ = 28821452. Its totient is φ = 28821450.

The previous prime is 28821449. The next prime is 28821479. The reversal of 28821451 is 15412882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28821451 - 2¹ = 28821449 is a prime.

Together with 28821449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28861451) 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 as a sum of consecutive naturals, namely, 14410725 + 14410726.

It is an arithmetic number, because the mean of its divisors is an integer number (14410726).

Almost surely, 2^28821451 is an apocalyptic number.

28821451 is a deficient number, since it is larger than the sum of its proper divisors (1).

28821451 is an equidigital number, since it uses as much as digits as its factorization.

28821451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5120, while the sum is 31.

The square root of 28821451 is about 5368.5613529138. The cubic root of 28821451 is about 306.5998564025.

The spelling of 28821451 in words is "twenty-eight million, eight hundred twenty-one thousand, four hundred fifty-one".