128252880431 has 4 divisors (see below), whose sum is σ = 138118486632. Its totient is φ = 118387274232.

The previous prime is 128252880373. The next prime is 128252880443. The reversal of 128252880431 is 134088252821.

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

It is a cyclic number.

It is not a de Polignac number, because 128252880431 - 2⁶ = 128252880367 is a prime.

It is a super-2 number, since 2×128252880431² (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 (128252882431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4932803081 + ... + 4932803106.

It is an arithmetic number, because the mean of its divisors is an integer number (34529621658).

Almost surely, 2^128252880431 is an apocalyptic number.

128252880431 is a deficient number, since it is larger than the sum of its proper divisors (9865606201).

128252880431 is an equidigital number, since it uses as much as digits as its factorization.

128252880431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9865606200.

The product of its (nonzero) digits is 245760, while the sum is 44.

The spelling of 128252880431 in words is "one hundred twenty-eight billion, two hundred fifty-two million, eight hundred eighty thousand, four hundred thirty-one".