28860661 has 2 divisors, whose sum is σ = 28860662. Its totient is φ = 28860660.

The previous prime is 28860647. The next prime is 28860683. The reversal of 28860661 is 16606882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20340100 + 8520561 = 4510^2 + 2919^2 .

It is a cyclic number.

It is not a de Polignac number, because 28860661 - 2¹⁵ = 28827893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28860661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28860691) 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, 14430330 + 14430331.

It is an arithmetic number, because the mean of its divisors is an integer number (14430331).

Almost surely, 2^28860661 is an apocalyptic number.

It is an amenable number.

28860661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28860661 is an equidigital number, since it uses as much as digits as its factorization.

28860661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 28860661 is about 5372.2119280609. The cubic root of 28860661 is about 306.7388308170.

The spelling of 28860661 in words is "twenty-eight million, eight hundred sixty thousand, six hundred sixty-one".