28145723 has 2 divisors, whose sum is σ = 28145724. Its totient is φ = 28145722.

The previous prime is 28145717. The next prime is 28145791. The reversal of 28145723 is 32754182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28145723 - 2¹⁸ = 27883579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28145723.

It is not a weakly prime, because it can be changed into another prime (28144723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14072861 + 14072862.

It is an arithmetic number, because the mean of its divisors is an integer number (14072862).

Almost surely, 2^28145723 is an apocalyptic number.

28145723 is a deficient number, since it is larger than the sum of its proper divisors (1).

28145723 is an equidigital number, since it uses as much as digits as its factorization.

28145723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 32.

The square root of 28145723 is about 5305.2542823130. The cubic root of 28145723 is about 304.1847726842.

The spelling of 28145723 in words is "twenty-eight million, one hundred forty-five thousand, seven hundred twenty-three".