128897005 has 16 divisors (see below), whose sum is σ = 158241600. Its totient is φ = 100762240.

The previous prime is 128896997. The next prime is 128897017. The reversal of 128897005 is 500798821.

It is not a de Polignac number, because 128897005 - 2³ = 128896997 is a prime.

It is a super-2 number, since 2×128897005² = 33228875795940050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51585 + ... + 54025.

It is an arithmetic number, because the mean of its divisors is an integer number (9890100).

Almost surely, 2^128897005 is an apocalyptic number.

It is an amenable number.

128897005 is a deficient number, since it is larger than the sum of its proper divisors (29344595).

128897005 is a wasteful number, since it uses less digits than its factorization.

128897005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2684.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 128897005 is about 11353.2816841652. The cubic root of 128897005 is about 505.1429259209.

The spelling of 128897005 in words is "one hundred twenty-eight million, eight hundred ninety-seven thousand, five".