28211031 has 16 divisors (see below), whose sum is σ = 41879520. Its totient is φ = 18768960.

The previous prime is 28211021. The next prime is 28211033. The reversal of 28211031 is 13011282.

It is not a de Polignac number, because 28211031 - 2⁹ = 28210519 is a prime.

It is a super-2 number, since 2×28211031² = 1591724540165922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28210995 and 28211013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28211033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19861 + ... + 21233.

It is an arithmetic number, because the mean of its divisors is an integer number (2617470).

Almost surely, 2^28211031 is an apocalyptic number.

28211031 is a deficient number, since it is larger than the sum of its proper divisors (13668489).

28211031 is a wasteful number, since it uses less digits than its factorization.

28211031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143 (or 2137 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 28211031 is about 5311.4057461279. The cubic root of 28211031 is about 304.4198629176.

The spelling of 28211031 in words is "twenty-eight million, two hundred eleven thousand, thirty-one".