28232912509 has 2 divisors, whose sum is σ = 28232912510. Its totient is φ = 28232912508.

The previous prime is 28232912507. The next prime is 28232912527. The reversal of 28232912509 is 90521923282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20195252100 + 8037660409 = 142110^2 + 89653^2 .

It is a cyclic number.

It is not a de Polignac number, because 28232912509 - 2¹ = 28232912507 is a prime.

Together with 28232912507, 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 (28232912507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14116456254 + 14116456255.

It is an arithmetic number, because the mean of its divisors is an integer number (14116456255).

Almost surely, 2^28232912509 is an apocalyptic number.

It is an amenable number.

28232912509 is a deficient number, since it is larger than the sum of its proper divisors (1).

28232912509 is an equidigital number, since it uses as much as digits as its factorization.

28232912509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 28232912509 in words is "twenty-eight billion, two hundred thirty-two million, nine hundred twelve thousand, five hundred nine".