28545637 has 4 divisors (see below), whose sum is σ = 29466496. Its totient is φ = 27624780.

The previous prime is 28545631. The next prime is 28545661. The reversal of 28545637 is 73654582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73654582 = 2 ⋅36827291.

It is a cyclic number.

It is not a de Polignac number, because 28545637 - 2¹⁹ = 28021349 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 28545637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28545631) 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, 460383 + ... + 460444.

It is an arithmetic number, because the mean of its divisors is an integer number (7366624).

Almost surely, 2^28545637 is an apocalyptic number.

It is an amenable number.

28545637 is a deficient number, since it is larger than the sum of its proper divisors (920859).

28545637 is an equidigital number, since it uses as much as digits as its factorization.

28545637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920858.

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

The square root of 28545637 is about 5342.8117129467. The cubic root of 28545637 is about 305.6186921776.

The spelling of 28545637 in words is "twenty-eight million, five hundred forty-five thousand, six hundred thirty-seven".