28815823 has 2 divisors, whose sum is σ = 28815824. Its totient is φ = 28815822.

The previous prime is 28815811. The next prime is 28815863. The reversal of 28815823 is 32851882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28815823 - 2¹³ = 28807631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28815863) 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, 14407911 + 14407912.

It is an arithmetic number, because the mean of its divisors is an integer number (14407912).

Almost surely, 2^28815823 is an apocalyptic number.

28815823 is a deficient number, since it is larger than the sum of its proper divisors (1).

28815823 is an equidigital number, since it uses as much as digits as its factorization.

28815823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30720, while the sum is 37.

The square root of 28815823 is about 5368.0371645509. The cubic root of 28815823 is about 306.5798983937.

The spelling of 28815823 in words is "twenty-eight million, eight hundred fifteen thousand, eight hundred twenty-three".