128436747 has 4 divisors (see below), whose sum is σ = 171249000. Its totient is φ = 85624496.

The previous prime is 128436739. The next prime is 128436767. The reversal of 128436747 is 747634821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 747634821 = 3 ⋅249211607.

It is a cyclic number.

It is not a de Polignac number, because 128436747 - 2³ = 128436739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128436699 and 128436708.

It is not an unprimeable number, because it can be changed into a prime (128436727) 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, 21406122 + ... + 21406127.

It is an arithmetic number, because the mean of its divisors is an integer number (42812250).

Almost surely, 2^128436747 is an apocalyptic number.

128436747 is a deficient number, since it is larger than the sum of its proper divisors (42812253).

128436747 is an equidigital number, since it uses as much as digits as its factorization.

128436747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42812252.

The product of its digits is 225792, while the sum is 42.

The square root of 128436747 is about 11332.9937351081. The cubic root of 128436747 is about 504.5409637809.

The spelling of 128436747 in words is "one hundred twenty-eight million, four hundred thirty-six thousand, seven hundred forty-seven".