128897934 has 32 divisors (see below), whose sum is σ = 293462784. Its totient is φ = 37361280.

The previous prime is 128897933. The next prime is 128897939. The reversal of 128897934 is 439798821.

It is a super-4 number, since 4×128897934⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128897933) 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, 40939 + ... + 43974.

It is an arithmetic number, because the mean of its divisors is an integer number (9170712).

Almost surely, 2^128897934 is an apocalyptic number.

128897934 is an abundant number, since it is smaller than the sum of its proper divisors (164564850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128897934 is a wasteful number, since it uses less digits than its factorization.

128897934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84952.

The product of its digits is 870912, while the sum is 51.

The square root of 128897934 is about 11353.3225973721. The cubic root of 128897934 is about 505.1441394910.

The spelling of 128897934 in words is "one hundred twenty-eight million, eight hundred ninety-seven thousand, nine hundred thirty-four".