128740427 has 8 divisors (see below), whose sum is σ = 136486272. Its totient is φ = 121219200.

The previous prime is 128740399. The next prime is 128740477. The reversal of 128740427 is 724047821.

It is a happy number.

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 128740427 - 2¹² = 128736331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128740477) 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, 54974 + ... + 57267.

It is an arithmetic number, because the mean of its divisors is an integer number (17060784).

Almost surely, 2^128740427 is an apocalyptic number.

128740427 is a deficient number, since it is larger than the sum of its proper divisors (7745845).

128740427 is a wasteful number, since it uses less digits than its factorization.

128740427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112309.

The product of its (nonzero) digits is 25088, while the sum is 35.

The square root of 128740427 is about 11346.3838732876. The cubic root of 128740427 is about 504.9383017784.

It can be divided in two parts, 1287 and 40427, that added together give a palindrome (41714).

The spelling of 128740427 in words is "one hundred twenty-eight million, seven hundred forty thousand, four hundred twenty-seven".