128266831 has 16 divisors (see below), whose sum is σ = 160224768. Its totient is φ = 99756000.

The previous prime is 128266823. The next prime is 128266841. The reversal of 128266831 is 138662821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 128266831 - 2³ = 128266823 is a prime.

It is a super-2 number, since 2×128266831² = 32904759869565122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128266841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49006 + ... + 51556.

It is an arithmetic number, because the mean of its divisors is an integer number (10014048).

Almost surely, 2^128266831 is an apocalyptic number.

128266831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128266831 is a deficient number, since it is larger than the sum of its proper divisors (31957937).

128266831 is a wasteful number, since it uses less digits than its factorization.

128266831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3222.

The product of its digits is 27648, while the sum is 37.

The square root of 128266831 is about 11325.4947353305. The cubic root of 128266831 is about 504.3183706428.

The spelling of 128266831 in words is "one hundred twenty-eight million, two hundred sixty-six thousand, eight hundred thirty-one".