28765657 has 2 divisors, whose sum is σ = 28765658. Its totient is φ = 28765656.

The previous prime is 28765643. The next prime is 28765661. The reversal of 28765657 is 75656782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27237961 + 1527696 = 5219^2 + 1236^2 .

It is a cyclic number.

It is not a de Polignac number, because 28765657 - 2¹⁵ = 28732889 is a prime.

It is not a weakly prime, because it can be changed into another prime (28765057) 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, 14382828 + 14382829.

It is an arithmetic number, because the mean of its divisors is an integer number (14382829).

Almost surely, 2^28765657 is an apocalyptic number.

It is an amenable number.

28765657 is a deficient number, since it is larger than the sum of its proper divisors (1).

28765657 is an equidigital number, since it uses as much as digits as its factorization.

28765657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 705600, while the sum is 46.

The square root of 28765657 is about 5363.3624714352. The cubic root of 28765657 is about 306.4018848434.

The spelling of 28765657 in words is "twenty-eight million, seven hundred sixty-five thousand, six hundred fifty-seven".