28865987 has 2 divisors, whose sum is σ = 28865988. Its totient is φ = 28865986.

The previous prime is 28865911. The next prime is 28865999. The reversal of 28865987 is 78956882.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28865987 - 2¹² = 28861891 is a prime.

It is not a weakly prime, because it can be changed into another prime (28865087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14432993 + 14432994.

It is an arithmetic number, because the mean of its divisors is an integer number (14432994).

Almost surely, 2^28865987 is an apocalyptic number.

28865987 is a deficient number, since it is larger than the sum of its proper divisors (1).

28865987 is an equidigital number, since it uses as much as digits as its factorization.

28865987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 53.

The square root of 28865987 is about 5372.7076041787. The cubic root of 28865987 is about 306.7576983743.

The spelling of 28865987 in words is "twenty-eight million, eight hundred sixty-five thousand, nine hundred eighty-seven".