28885657 has 2 divisors, whose sum is σ = 28885658. Its totient is φ = 28885656.

The previous prime is 28885651. The next prime is 28885663. The reversal of 28885657 is 75658882.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (28885651) and next prime (28885663).

It can be written as a sum of positive squares in only one way, i.e., 25290841 + 3594816 = 5029^2 + 1896^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28885657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28885657.

It is not a weakly prime, because it can be changed into another prime (28885651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14442828 + 14442829.

It is an arithmetic number, because the mean of its divisors is an integer number (14442829).

Almost surely, 2^28885657 is an apocalyptic number.

It is an amenable number.

28885657 is a deficient number, since it is larger than the sum of its proper divisors (1).

28885657 is an equidigital number, since it uses as much as digits as its factorization.

28885657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1075200, while the sum is 49.

The square root of 28885657 is about 5374.5378405962. The cubic root of 28885657 is about 306.8273599901.

The spelling of 28885657 in words is "twenty-eight million, eight hundred eighty-five thousand, six hundred fifty-seven".