128742071 has 16 divisors (see below), whose sum is σ = 141626880. Its totient is φ = 116538240.

The previous prime is 128742023. The next prime is 128742151. The reversal of 128742071 is 170247821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 128742071 - 2⁶ = 128742007 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 (128742011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45776 + ... + 48506.

It is an arithmetic number, because the mean of its divisors is an integer number (8851680).

Almost surely, 2^128742071 is an apocalyptic number.

128742071 is a deficient number, since it is larger than the sum of its proper divisors (12884809).

128742071 is a wasteful number, since it uses less digits than its factorization.

128742071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2854.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 128742071 is about 11346.4563190452. The cubic root of 128742071 is about 504.9404511034.

Adding to 128742071 its reverse (170247821), we get a palindrome (298989892).

The spelling of 128742071 in words is "one hundred twenty-eight million, seven hundred forty-two thousand, seventy-one".