28432131 has 16 divisors (see below), whose sum is σ = 46658304. Its totient is φ = 14997024.

The previous prime is 28432127. The next prime is 28432171. The reversal of 28432131 is 13123482.

It is not a de Polignac number, because 28432131 - 2² = 28432127 is a prime.

It is a super-2 number, since 2×28432131² = 1616772146402322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28432121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51801 + ... + 52346.

It is an arithmetic number, because the mean of its divisors is an integer number (2916144).

Almost surely, 2^28432131 is an apocalyptic number.

28432131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28432131 is a deficient number, since it is larger than the sum of its proper divisors (18226173).

28432131 is a wasteful number, since it uses less digits than its factorization.

28432131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104170.

The product of its digits is 1152, while the sum is 24.

The square root of 28432131 is about 5332.1788229578. The cubic root of 28432131 is about 305.2130769424.

The spelling of 28432131 in words is "twenty-eight million, four hundred thirty-two thousand, one hundred thirty-one".