28309557767616 has 84 divisors (see below), whose sum is σ = 81146441617384. Its totient is φ = 9436262745600.

The previous prime is 28309557767591. The next prime is 28309557767627. The reversal of 28309557767616 is 61676775590382.

It is a happy number.

28309557767616 is a `hidden beast` number, since 2 + 8 + 3 + 0 + 9 + 557 + 7 + 6 + 7 + 61 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21158871 + ... + 22457001.

Almost surely, 2^{28309557767616} is an apocalyptic number.

It is an amenable number.

28309557767616 is an abundant number, since it is smaller than the sum of its proper divisors (52836883849768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28309557767616 is a wasteful number, since it uses less digits than its factorization.

28309557767616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336010 (or 1335997 counting only the distinct ones).

The product of its (nonzero) digits is 800150400, while the sum is 72.

The spelling of 28309557767616 in words is "twenty-eight trillion, three hundred nine billion, five hundred fifty-seven million, seven hundred sixty-seven thousand, six hundred sixteen".