28866637 has 2 divisors, whose sum is σ = 28866638. Its totient is φ = 28866636.

The previous prime is 28866599. The next prime is 28866689. The reversal of 28866637 is 73666882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24000201 + 4866436 = 4899^2 + 2206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28866637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28866737) 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, 14433318 + 14433319.

It is an arithmetic number, because the mean of its divisors is an integer number (14433319).

Almost surely, 2^28866637 is an apocalyptic number.

It is an amenable number.

28866637 is a deficient number, since it is larger than the sum of its proper divisors (1).

28866637 is an equidigital number, since it uses as much as digits as its factorization.

28866637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 46.

The square root of 28866637 is about 5372.7680947534. The cubic root of 28866637 is about 306.7600008651.

The spelling of 28866637 in words is "twenty-eight million, eight hundred sixty-six thousand, six hundred thirty-seven".