128535831 has 12 divisors (see below), whose sum is σ = 185763760. Its totient is φ = 85644000.

The previous prime is 128535821. The next prime is 128535851. The reversal of 128535831 is 138535821.

128535831 is a `hidden beast` number, since 1 + 28 + 53 + 583 + 1 = 666.

It is not a de Polignac number, because 128535831 - 2¹³ = 128527639 is a prime.

It is a super-2 number, since 2×128535831² = 33042919701721122, 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 (128535821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24630 + ... + 29388.

Almost surely, 2^128535831 is an apocalyptic number.

128535831 is a deficient number, since it is larger than the sum of its proper divisors (57227929).

128535831 is a wasteful number, since it uses less digits than its factorization.

128535831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7766 (or 7763 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 128535831 is about 11337.3643762561. The cubic root of 128535831 is about 504.6706750665.

The spelling of 128535831 in words is "one hundred twenty-eight million, five hundred thirty-five thousand, eight hundred thirty-one".