128024432677 has 4 divisors (see below), whose sum is σ = 135555281676. Its totient is φ = 120493583680.

The previous prime is 128024432659. The next prime is 128024432689. The reversal of 128024432677 is 776234420821.

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

It can be written as a sum of positive squares in 2 ways, for example, as 119098151236 + 8926281441 = 345106^2 + 94479^2 .

It is a cyclic number.

It is not a de Polignac number, because 128024432677 - 2¹¹ = 128024430629 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 (128024439677) 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, 3765424474 + ... + 3765424507.

It is an arithmetic number, because the mean of its divisors is an integer number (33888820419).

Almost surely, 2^128024432677 is an apocalyptic number.

128024432677 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128024432677 is a deficient number, since it is larger than the sum of its proper divisors (7530848999).

128024432677 is an equidigital number, since it uses as much as digits as its factorization.

128024432677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7530848998.

The product of its (nonzero) digits is 903168, while the sum is 46.

The spelling of 128024432677 in words is "one hundred twenty-eight billion, twenty-four million, four hundred thirty-two thousand, six hundred seventy-seven".