28202131 has 4 divisors (see below), whose sum is σ = 28559200. Its totient is φ = 27845064.

The previous prime is 28202113. The next prime is 28202143. The reversal of 28202131 is 13120282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28202131 - 2¹⁵ = 28169363 is a prime.

It is a super-2 number, since 2×28202131² = 1590720385882322, 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 = 28202099 and 28202108.

It is not an unprimeable number, because it can be changed into a prime (28202101) 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 3 ways as a sum of consecutive naturals, for example, 178416 + ... + 178573.

It is an arithmetic number, because the mean of its divisors is an integer number (7139800).

Almost surely, 2^28202131 is an apocalyptic number.

28202131 is a deficient number, since it is larger than the sum of its proper divisors (357069).

28202131 is an equidigital number, since it uses as much as digits as its factorization.

28202131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357068.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 28202131 is about 5310.5678604082. The cubic root of 28202131 is about 304.3878468156.

The spelling of 28202131 in words is "twenty-eight million, two hundred two thousand, one hundred thirty-one".