28643873 has 2 divisors, whose sum is σ = 28643874. Its totient is φ = 28643872.

The previous prime is 28643863. The next prime is 28643897. The reversal of 28643873 is 37834682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15626209 + 13017664 = 3953^2 + 3608^2 .

It is a cyclic number.

It is not a de Polignac number, because 28643873 - 2⁸ = 28643617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28643873.

It is not a weakly prime, because it can be changed into another prime (28643843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14321936 + 14321937.

It is an arithmetic number, because the mean of its divisors is an integer number (14321937).

Almost surely, 2^28643873 is an apocalyptic number.

It is an amenable number.

28643873 is a deficient number, since it is larger than the sum of its proper divisors (1).

28643873 is an equidigital number, since it uses as much as digits as its factorization.

28643873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 41.

The square root of 28643873 is about 5351.9971038856. The cubic root of 28643873 is about 305.9688727647.

The spelling of 28643873 in words is "twenty-eight million, six hundred forty-three thousand, eight hundred seventy-three".