128896512439 has 4 divisors (see below), whose sum is σ = 134500708656. Its totient is φ = 123292316224.

The previous prime is 128896512431. The next prime is 128896512461. The reversal of 128896512439 is 934215698821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 128896512439 - 2³ = 128896512431 is a prime.

It is a super-2 number, since 2×128896512439² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128896512431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2802098074 + ... + 2802098119.

It is an arithmetic number, because the mean of its divisors is an integer number (33625177164).

Almost surely, 2^128896512439 is an apocalyptic number.

128896512439 is a deficient number, since it is larger than the sum of its proper divisors (5604196217).

128896512439 is an equidigital number, since it uses as much as digits as its factorization.

128896512439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5604196216.

The product of its digits is 7464960, while the sum is 58.

The spelling of 128896512439 in words is "one hundred twenty-eight billion, eight hundred ninety-six million, five hundred twelve thousand, four hundred thirty-nine".