128642137 has 8 divisors (see below), whose sum is σ = 139536320. Its totient is φ = 117890640.

The previous prime is 128642123. The next prime is 128642153. The reversal of 128642137 is 731246821.

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 128642137 - 2¹⁹ = 128117849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128642167) 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, 33789 + ... + 37402.

It is an arithmetic number, because the mean of its divisors is an integer number (17442040).

Almost surely, 2^128642137 is an apocalyptic number.

It is an amenable number.

128642137 is a deficient number, since it is larger than the sum of its proper divisors (10894183).

128642137 is a wasteful number, since it uses less digits than its factorization.

128642137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71343.

The product of its digits is 16128, while the sum is 34.

The square root of 128642137 is about 11342.0517103388. The cubic root of 128642137 is about 504.8097665993.

Adding to 128642137 its reverse (731246821), we get a palindrome (859888958).

The spelling of 128642137 in words is "one hundred twenty-eight million, six hundred forty-two thousand, one hundred thirty-seven".