28781126655 has 16 divisors (see below), whose sum is σ = 46069396704. Its totient is φ = 15343402880.

The previous prime is 28781126653. The next prime is 28781126669. The reversal of 28781126655 is 55662118782.

It is not a de Polignac number, because 28781126655 - 2¹ = 28781126653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28781126598 and 28781126607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28781126653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 371676 + ... + 442385.

It is an arithmetic number, because the mean of its divisors is an integer number (2879337294).

Almost surely, 2^28781126655 is an apocalyptic number.

28781126655 is a deficient number, since it is larger than the sum of its proper divisors (17288270049).

28781126655 is a wasteful number, since it uses less digits than its factorization.

28781126655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816426.

The product of its digits is 1612800, while the sum is 51.

The spelling of 28781126655 in words is "twenty-eight billion, seven hundred eighty-one million, one hundred twenty-six thousand, six hundred fifty-five".