128657207793 has 8 divisors (see below), whose sum is σ = 173061023328. Its totient is φ = 85012432064.

The previous prime is 128657207761. The next prime is 128657207807. The reversal of 128657207793 is 397702756821.

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 128657207793 - 2⁵ = 128657207761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128657207713) 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, 189759555 + ... + 189760232.

It is an arithmetic number, because the mean of its divisors is an integer number (21632627916).

Almost surely, 2^128657207793 is an apocalyptic number.

It is an amenable number.

128657207793 is a deficient number, since it is larger than the sum of its proper divisors (44403815535).

128657207793 is a wasteful number, since it uses less digits than its factorization.

128657207793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379519903.

The product of its (nonzero) digits is 8890560, while the sum is 57.

The spelling of 128657207793 in words is "one hundred twenty-eight billion, six hundred fifty-seven million, two hundred seven thousand, seven hundred ninety-three".