128717693 has 8 divisors (see below), whose sum is σ = 146773368. Its totient is φ = 111826944.

The previous prime is 128717681. The next prime is 128717707. The reversal of 128717693 is 396717821.

It can be written as a sum of positive squares in 4 ways, for example, as 76729 + 128640964 = 277^2 + 11342^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128717693 - 2⁶ = 128717629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128717663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290996 + ... + 291437.

It is an arithmetic number, because the mean of its divisors is an integer number (18346671).

Almost surely, 2^128717693 is an apocalyptic number.

128717693 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

128717693 is a deficient number, since it is larger than the sum of its proper divisors (18055675).

128717693 is a wasteful number, since it uses less digits than its factorization.

128717693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582463.

The product of its digits is 127008, while the sum is 44.

The square root of 128717693 is about 11345.3820120787. The cubic root of 128717693 is about 504.9085780328.

The spelling of 128717693 in words is "one hundred twenty-eight million, seven hundred seventeen thousand, six hundred ninety-three".