128993697 has 36 divisors (see below), whose sum is σ = 220669696. Its totient is φ = 71055360.

The previous prime is 128993687. The next prime is 128993699. The reversal of 128993697 is 796399821.

It is not a de Polignac number, because 128993697 - 2¹⁴ = 128977313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128993699) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 501793 + ... + 502049.

Almost surely, 2^128993697 is an apocalyptic number.

It is an amenable number.

128993697 is a deficient number, since it is larger than the sum of its proper divisors (91675999).

128993697 is an equidigital number, since it uses as much as digits as its factorization.

128993697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558 (or 298 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 128993697 is about 11357.5392141080. The cubic root of 128993697 is about 505.2692052233.

The spelling of 128993697 in words is "one hundred twenty-eight million, nine hundred ninety-three thousand, six hundred ninety-seven".