28666837 has 2 divisors, whose sum is σ = 28666838. Its totient is φ = 28666836.

The previous prime is 28666817. The next prime is 28666843. The reversal of 28666837 is 73866682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28665316 + 1521 = 5354^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 28666837 - 2¹⁹ = 28142549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28666817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14333418 + 14333419.

It is an arithmetic number, because the mean of its divisors is an integer number (14333419).

Almost surely, 2^28666837 is an apocalyptic number.

It is an amenable number.

28666837 is a deficient number, since it is larger than the sum of its proper divisors (1).

28666837 is an equidigital number, since it uses as much as digits as its factorization.

28666837 is an evil number, because the sum of its binary digits is even.

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

The square root of 28666837 is about 5354.1420414479. The cubic root of 28666837 is about 306.0506167425.

The spelling of 28666837 in words is "twenty-eight million, six hundred sixty-six thousand, eight hundred thirty-seven".