28531037 has 4 divisors (see below), whose sum is σ = 28545756. Its totient is φ = 28516320.

The previous prime is 28530979. The next prime is 28531051. The reversal of 28531037 is 73013582.

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 22033636 + 6497401 = 4694^2 + 2549^2 .

It is a cyclic number.

It is not a de Polignac number, because 28531037 - 2¹² = 28526941 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 (28531057) 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, 3914 + ... + 8507.

It is an arithmetic number, because the mean of its divisors is an integer number (7136439).

Almost surely, 2^28531037 is an apocalyptic number.

It is an amenable number.

28531037 is a deficient number, since it is larger than the sum of its proper divisors (14719).

28531037 is a wasteful number, since it uses less digits than its factorization.

28531037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14718.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 28531037 is about 5341.4452164185. The cubic root of 28531037 is about 305.5665792068.

The spelling of 28531037 in words is "twenty-eight million, five hundred thirty-one thousand, thirty-seven".