28457641 has 2 divisors, whose sum is σ = 28457642. Its totient is φ = 28457640.

The previous prime is 28457633. The next prime is 28457669. The reversal of 28457641 is 14675482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16032016 + 12425625 = 4004^2 + 3525^2 .

It is a cyclic number.

It is not a de Polignac number, because 28457641 - 2³ = 28457633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28457641.

It is not a weakly prime, because it can be changed into another prime (28457441) 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, 14228820 + 14228821.

It is an arithmetic number, because the mean of its divisors is an integer number (14228821).

Almost surely, 2^28457641 is an apocalyptic number.

It is an amenable number.

28457641 is a deficient number, since it is larger than the sum of its proper divisors (1).

28457641 is an equidigital number, since it uses as much as digits as its factorization.

28457641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 37.

The square root of 28457641 is about 5334.5703669555. The cubic root of 28457641 is about 305.3043311899.

The spelling of 28457641 in words is "twenty-eight million, four hundred fifty-seven thousand, six hundred forty-one".