28105661653784 has 64 divisors (see below), whose sum is σ = 62088469380000. Its totient is φ = 11758795499520.

The previous prime is 28105661653777. The next prime is 28105661653841. The reversal of 28105661653784 is 48735616650182.

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, 34798289 + ... + 35596800.

Almost surely, 2^{28105661653784} is an apocalyptic number.

It is an amenable number.

28105661653784 is an abundant number, since it is smaller than the sum of its proper divisors (33982807726216).

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

28105661653784 is a wasteful number, since it uses less digits than its factorization.

28105661653784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70395468 (or 70395464 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 62.

The spelling of 28105661653784 in words is "twenty-eight trillion, one hundred five billion, six hundred sixty-one million, six hundred fifty-three thousand, seven hundred eighty-four".