128207697 has 16 divisors (see below), whose sum is σ = 175535808. Its totient is φ = 83185920.

The previous prime is 128207671. The next prime is 128207699. The reversal of 128207697 is 796702821.

It is not a de Polignac number, because 128207697 - 2⁶ = 128207633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128207699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63333 + ... + 65325.

It is an arithmetic number, because the mean of its divisors is an integer number (10970988).

Almost surely, 2^128207697 is an apocalyptic number.

It is an amenable number.

128207697 is a deficient number, since it is larger than the sum of its proper divisors (47328111).

128207697 is a wasteful number, since it uses less digits than its factorization.

128207697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 128207697 is about 11322.8837757879. The cubic root of 128207697 is about 504.2408578870.

The spelling of 128207697 in words is "one hundred twenty-eight million, two hundred seven thousand, six hundred ninety-seven".