128506568787 has 24 divisors (see below), whose sum is σ = 186520043424. Its totient is φ = 85256682624.

The previous prime is 128506568777. The next prime is 128506568791. The reversal of 128506568787 is 787865605821.

128506568787 is a `hidden beast` number, since 1 + 2 + 8 + 506 + 56 + 8 + 78 + 7 = 666.

It is not a de Polignac number, because 128506568787 - 2¹¹ = 128506566739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128506568777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2020423 + ... + 2083055.

It is an arithmetic number, because the mean of its divisors is an integer number (7771668476).

Almost surely, 2^128506568787 is an apocalyptic number.

128506568787 is a deficient number, since it is larger than the sum of its proper divisors (58013474637).

128506568787 is a wasteful number, since it uses less digits than its factorization.

128506568787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63739 (or 63736 counting only the distinct ones).

The product of its (nonzero) digits is 45158400, while the sum is 63.

The spelling of 128506568787 in words is "one hundred twenty-eight billion, five hundred six million, five hundred sixty-eight thousand, seven hundred eighty-seven".