28444657 has 2 divisors, whose sum is σ = 28444658. Its totient is φ = 28444656.

The previous prime is 28444597. The next prime is 28444697. The reversal of 28444657 is 75644482.

It is a happy number.

It is an a-pointer prime, because the next prime (28444697) can be obtained adding 28444657 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26946481 + 1498176 = 5191^2 + 1224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28444657 is a prime.

It is equal to p_1767379 and since 28444657 and 1767379 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28444697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14222328 + 14222329.

It is an arithmetic number, because the mean of its divisors is an integer number (14222329).

Almost surely, 2^28444657 is an apocalyptic number.

It is an amenable number.

28444657 is a deficient number, since it is larger than the sum of its proper divisors (1).

28444657 is an equidigital number, since it uses as much as digits as its factorization.

28444657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 215040, while the sum is 40.

The square root of 28444657 is about 5333.3532603794. The cubic root of 28444657 is about 305.2578917062.

The spelling of 28444657 in words is "twenty-eight million, four hundred forty-four thousand, six hundred fifty-seven".