28009437156789 has 24 divisors (see below), whose sum is σ = 41082249065760. Its totient is φ = 16961932928160.

The previous prime is 28009437156763. The next prime is 28009437156797. The reversal of 28009437156789 is 98765173490082.

It is not a de Polignac number, because 28009437156789 - 2³³ = 28000847222197 is a prime.

It is a super-2 number, since 2×28009437156789² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28009437156889) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30186742 + ... + 31100775.

It is an arithmetic number, because the mean of its divisors is an integer number (1711760377740).

It is a 1-persistent number, because it is pandigital, but 2⋅28009437156789 = 56018874313578 is not.

Almost surely, 2^{28009437156789} is an apocalyptic number.

It is an amenable number.

28009437156789 is a deficient number, since it is larger than the sum of its proper divisors (13072811908971).

28009437156789 is a wasteful number, since it uses less digits than its factorization.

28009437156789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61288801 (or 61288790 counting only the distinct ones).

The product of its (nonzero) digits is 182891520, while the sum is 69.

The spelling of 28009437156789 in words is "twenty-eight trillion, nine billion, four hundred thirty-seven million, one hundred fifty-six thousand, seven hundred eighty-nine".