28010087509 has 2 divisors, whose sum is σ = 28010087510. Its totient is φ = 28010087508.

The previous prime is 28010087507. The next prime is 28010087531. The reversal of 28010087509 is 90578001082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15074437284 + 12935650225 = 122778^2 + 113735^2 .

It is a cyclic number.

It is not a de Polignac number, because 28010087509 - 2¹ = 28010087507 is a prime.

Together with 28010087507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28010087507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14005043754 + 14005043755.

It is an arithmetic number, because the mean of its divisors is an integer number (14005043755).

Almost surely, 2^28010087509 is an apocalyptic number.

It is an amenable number.

28010087509 is a deficient number, since it is larger than the sum of its proper divisors (1).

28010087509 is an equidigital number, since it uses as much as digits as its factorization.

28010087509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 40.

The spelling of 28010087509 in words is "twenty-eight billion, ten million, eighty-seven thousand, five hundred nine".