128824831 has 4 divisors (see below), whose sum is σ = 128885512. Its totient is φ = 128764152.

The previous prime is 128824823. The next prime is 128824841. The reversal of 128824831 is 138428821.

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 128824831 - 2³ = 128824823 is a prime.

It is a super-2 number, since 2×128824831² = 33191674164357122, which 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 (128824841) 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, 27036 + ... + 31441.

It is an arithmetic number, because the mean of its divisors is an integer number (32221378).

Almost surely, 2^128824831 is an apocalyptic number.

128824831 is a deficient number, since it is larger than the sum of its proper divisors (60681).

128824831 is an equidigital number, since it uses as much as digits as its factorization.

128824831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60680.

The product of its digits is 24576, while the sum is 37.

The square root of 128824831 is about 11350.1026867602. The cubic root of 128824831 is about 505.0486258441.

The spelling of 128824831 in words is "one hundred twenty-eight million, eight hundred twenty-four thousand, eight hundred thirty-one".