28040512509 has 12 divisors (see below), whose sum is σ = 40523962752. Its totient is φ = 18683982600.

The previous prime is 28040512477. The next prime is 28040512517. The reversal of 28040512509 is 90521504082.

It is not a de Polignac number, because 28040512509 - 2⁵ = 28040512477 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28040512529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 789357 + ... + 824114.

It is an arithmetic number, because the mean of its divisors is an integer number (3376996896).

Almost surely, 2^28040512509 is an apocalyptic number.

It is an amenable number.

28040512509 is a deficient number, since it is larger than the sum of its proper divisors (12483450243).

28040512509 is a wasteful number, since it uses less digits than its factorization.

28040512509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615408 (or 1615405 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 28040512509 in words is "twenty-eight billion, forty million, five hundred twelve thousand, five hundred nine".