28509277987 has 2 divisors, whose sum is σ = 28509277988. Its totient is φ = 28509277986.

The previous prime is 28509277969. The next prime is 28509278029. The reversal of 28509277987 is 78977290582.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28509277987 is a prime.

It is not a weakly prime, because it can be changed into another prime (28509277957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14254638993 + 14254638994.

It is an arithmetic number, because the mean of its divisors is an integer number (14254638994).

Almost surely, 2^28509277987 is an apocalyptic number.

28509277987 is a deficient number, since it is larger than the sum of its proper divisors (1).

28509277987 is an equidigital number, since it uses as much as digits as its factorization.

28509277987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35562240, while the sum is 64.

The spelling of 28509277987 in words is "twenty-eight billion, five hundred nine million, two hundred seventy-seven thousand, nine hundred eighty-seven".