28465537 has 4 divisors (see below), whose sum is σ = 28747476. Its totient is φ = 28183600.

The previous prime is 28465529. The next prime is 28465561. The reversal of 28465537 is 73556482.

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 14930496 + 13535041 = 3864^2 + 3679^2 .

It is a cyclic number.

It is not a de Polignac number, because 28465537 - 2³ = 28465529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28465537.

It is not an unprimeable number, because it can be changed into a prime (28465337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140818 + ... + 141019.

It is an arithmetic number, because the mean of its divisors is an integer number (7186869).

Almost surely, 2^28465537 is an apocalyptic number.

It is an amenable number.

28465537 is a deficient number, since it is larger than the sum of its proper divisors (281939).

28465537 is a wasteful number, since it uses less digits than its factorization.

28465537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281938.

The product of its digits is 201600, while the sum is 40.

The square root of 28465537 is about 5335.3103939696. The cubic root of 28465537 is about 305.3325656698.

The spelling of 28465537 in words is "twenty-eight million, four hundred sixty-five thousand, five hundred thirty-seven".