128567787273 has 10 divisors (see below), whose sum is σ = 192058052714. Its totient is φ = 85711858128.

The previous prime is 128567787269. The next prime is 128567787281. The reversal of 128567787273 is 372787765821.

128567787273 is a `hidden beast` number, since 1 + 285 + 6 + 7 + 7 + 87 + 273 = 666.

It can be written as a sum of positive squares in only one way, i.e., 128255664384 + 312122889 = 358128^2 + 17667^2 .

It is not a de Polignac number, because 128567787273 - 2² = 128567787269 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128567787273.

It is not an unprimeable number, because it can be changed into a prime (128567787203) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 793628236 + ... + 793628397.

Almost surely, 2^128567787273 is an apocalyptic number.

It is an amenable number.

128567787273 is a deficient number, since it is larger than the sum of its proper divisors (63490265441).

128567787273 is an equidigital number, since it uses as much as digits as its factorization.

128567787273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587256645 (or 1587256636 counting only the distinct ones).

The product of its digits is 55319040, while the sum is 63.

The spelling of 128567787273 in words is "one hundred twenty-eight billion, five hundred sixty-seven million, seven hundred eighty-seven thousand, two hundred seventy-three".