28022537 has 4 divisors (see below), whose sum is σ = 28126980. Its totient is φ = 27918096.

The previous prime is 28022521. The next prime is 28022563. The reversal of 28022537 is 73522082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4393216 + 23629321 = 2096^2 + 4861^2 .

It is a cyclic number.

It is not a de Polignac number, because 28022537 - 2⁴ = 28022521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28022567) 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, 51818 + ... + 52355.

It is an arithmetic number, because the mean of its divisors is an integer number (7031745).

Almost surely, 2^28022537 is an apocalyptic number.

It is an amenable number.

28022537 is a deficient number, since it is larger than the sum of its proper divisors (104443).

28022537 is a wasteful number, since it uses less digits than its factorization.

28022537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104442.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 28022537 is about 5293.6317401194. The cubic root of 28022537 is about 303.7403462980.

The spelling of 28022537 in words is "twenty-eight million, twenty-two thousand, five hundred thirty-seven".