128007647 has 4 divisors (see below), whose sum is σ = 128050656. Its totient is φ = 127964640.

The previous prime is 128007619. The next prime is 128007661. The reversal of 128007647 is 746700821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746700821 = 599 ⋅1246579.

It is a cyclic number.

It is not a de Polignac number, because 128007647 - 2¹⁸ = 127745503 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 (128007697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16679 + ... + 23112.

It is an arithmetic number, because the mean of its divisors is an integer number (32012664).

Almost surely, 2^128007647 is an apocalyptic number.

128007647 is a deficient number, since it is larger than the sum of its proper divisors (43009).

128007647 is an equidigital number, since it uses as much as digits as its factorization.

128007647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43008.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 128007647 is about 11314.0464467846. The cubic root of 128007647 is about 503.9784558167.

The spelling of 128007647 in words is "one hundred twenty-eight million, seven thousand, six hundred forty-seven".