28781366526 has 64 divisors (see below), whose sum is σ = 72806653440. Its totient is φ = 8342421120.

The previous prime is 28781366513. The next prime is 28781366531. The reversal of 28781366526 is 62566318782.

28781366526 is a `hidden beast` number, since 2 + 8 + 7 + 81 + 36 + 6 + 526 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1039675 + ... + 1066998.

It is an arithmetic number, because the mean of its divisors is an integer number (1137603960).

Almost surely, 2^28781366526 is an apocalyptic number.

28781366526 is an abundant number, since it is smaller than the sum of its proper divisors (44025286914).

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

28781366526 is a wasteful number, since it uses less digits than its factorization.

28781366526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106718 (or 2106712 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 28781366526 in words is "twenty-eight billion, seven hundred eighty-one million, three hundred sixty-six thousand, five hundred twenty-six".