28637863 has 2 divisors, whose sum is σ = 28637864. Its totient is φ = 28637862.

The previous prime is 28637857. The next prime is 28637879. The reversal of 28637863 is 36873682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28637863 - 2¹⁷ = 28506791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28634863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14318931 + 14318932.

It is an arithmetic number, because the mean of its divisors is an integer number (14318932).

Almost surely, 2^28637863 is an apocalyptic number.

28637863 is a deficient number, since it is larger than the sum of its proper divisors (1).

28637863 is an equidigital number, since it uses as much as digits as its factorization.

28637863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 43.

The square root of 28637863 is about 5351.4356017801. The cubic root of 28637863 is about 305.9474720094.

The spelling of 28637863 in words is "twenty-eight million, six hundred thirty-seven thousand, eight hundred sixty-three".