28022031 has 18 divisors (see below), whose sum is σ = 42040752. Its totient is φ = 18676980.

The previous prime is 28022009. The next prime is 28022041. The reversal of 28022031 is 13022082.

It is a happy number.

It is not a de Polignac number, because 28022031 - 2¹⁷ = 27890959 is a prime.

It is a super-2 number, since 2×28022031² = 1570468442729922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28021995 and 28022013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28022041) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4426 + ... + 8696.

Almost surely, 2^28022031 is an apocalyptic number.

28022031 is a deficient number, since it is larger than the sum of its proper divisors (14018721).

28022031 is an frugal number, since it uses more digits than its factorization.

28022031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4295 (or 4274 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 28022031 is about 5293.5839466282. The cubic root of 28022031 is about 303.7385180845.

The spelling of 28022031 in words is "twenty-eight million, twenty-two thousand, thirty-one".