28540657 has 2 divisors, whose sum is σ = 28540658. Its totient is φ = 28540656.

The previous prime is 28540643. The next prime is 28540693. The reversal of 28540657 is 75604582.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25040016 + 3500641 = 5004^2 + 1871^2 .

It is a cyclic number.

It is not a de Polignac number, because 28540657 - 2¹⁵ = 28507889 is a prime.

It is not a weakly prime, because it can be changed into another prime (28540607) 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, 14270328 + 14270329.

It is an arithmetic number, because the mean of its divisors is an integer number (14270329).

Almost surely, 2^28540657 is an apocalyptic number.

It is an amenable number.

28540657 is a deficient number, since it is larger than the sum of its proper divisors (1).

28540657 is an equidigital number, since it uses as much as digits as its factorization.

28540657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 28540657 is about 5342.3456458750. The cubic root of 28540657 is about 305.6009186547.

The spelling of 28540657 in words is "twenty-eight million, five hundred forty thousand, six hundred fifty-seven".