28117432782456 has 64 divisors (see below), whose sum is σ = 71381658240000. Its totient is φ = 9228061704576.

The previous prime is 28117432782443. The next prime is 28117432782533. The reversal of 28117432782456 is 65428723471182.

It is a self number, because there is not a number n which added to its sum of digits gives 28117432782456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19973751 + ... + 21335078.

It is an arithmetic number, because the mean of its divisors is an integer number (1115338410000).

Almost surely, 2^{28117432782456} is an apocalyptic number.

It is an amenable number.

28117432782456 is an abundant number, since it is smaller than the sum of its proper divisors (43264225457544).

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

28117432782456 is a wasteful number, since it uses less digits than its factorization.

28117432782456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41309276 (or 41309272 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 60.

The spelling of 28117432782456 in words is "twenty-eight trillion, one hundred seventeen billion, four hundred thirty-two million, seven hundred eighty-two thousand, four hundred fifty-six".