28005037 has 4 divisors (see below), whose sum is σ = 28088476. Its totient is φ = 27921600.

The previous prime is 28005023. The next prime is 28005073. The reversal of 28005037 is 73050082.

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 11634921 + 16370116 = 3411^2 + 4046^2 .

It is a cyclic number.

It is not a de Polignac number, because 28005037 - 2⁷ = 28004909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28005437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41214 + ... + 41887.

It is an arithmetic number, because the mean of its divisors is an integer number (7022119).

Almost surely, 2^28005037 is an apocalyptic number.

It is an amenable number.

28005037 is a deficient number, since it is larger than the sum of its proper divisors (83439).

28005037 is an equidigital number, since it uses as much as digits as its factorization.

28005037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83438.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 28005037 is about 5291.9785524887. The cubic root of 28005037 is about 303.6771047847.

The spelling of 28005037 in words is "twenty-eight million, five thousand, thirty-seven".