128692081 has 12 divisors (see below), whose sum is σ = 151511472. Its totient is φ = 108975048.

The previous prime is 128692051. The next prime is 128692093. The reversal of 128692081 is 180296821.

It is not a de Polignac number, because 128692081 - 2⁹ = 128691569 is a prime.

It is a super-2 number, since 2×128692081² = 33123303424221122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128692081.

It is not an unprimeable number, because it can be changed into a prime (128692001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11755 + ... + 19888.

It is an arithmetic number, because the mean of its divisors is an integer number (12625956).

Almost surely, 2^128692081 is an apocalyptic number.

It is an amenable number.

128692081 is a deficient number, since it is larger than the sum of its proper divisors (22819391).

128692081 is an equidigital number, since it uses as much as digits as its factorization.

128692081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31740 (or 31733 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 128692081 is about 11344.2532147339. The cubic root of 128692081 is about 504.8750872308.

The spelling of 128692081 in words is "one hundred twenty-eight million, six hundred ninety-two thousand, eighty-one".