28200031 has 6 divisors (see below), whose sum is σ = 28984200. Its totient is φ = 27436536.

The previous prime is 28200023. The next prime is 28200071. The reversal of 28200031 is 13000282.

It is a happy number.

It is not a de Polignac number, because 28200031 - 2³ = 28200023 is a prime.

It is a super-2 number, since 2×28200031² = 1590483496801922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28199978 and 28200014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28200071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8931 + ... + 11668.

It is an arithmetic number, because the mean of its divisors is an integer number (4830700).

Almost surely, 2^28200031 is an apocalyptic number.

28200031 is a deficient number, since it is larger than the sum of its proper divisors (784169).

28200031 is an equidigital number, since it uses as much as digits as its factorization.

28200031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20673 (or 20636 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 28200031 is about 5310.3701377588. The cubic root of 28200031 is about 304.3802914723.

The spelling of 28200031 in words is "twenty-eight million, two hundred thousand, thirty-one".