28432685 has 4 divisors (see below), whose sum is σ = 34119228. Its totient is φ = 22746144.

The previous prime is 28432661. The next prime is 28432699. The reversal of 28432685 is 58623482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58623482 = 2 ⋅29311741.

It can be written as a sum of positive squares in 2 ways, for example, as 21104836 + 7327849 = 4594^2 + 2707^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28432685 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2843264 + ... + 2843273.

It is an arithmetic number, because the mean of its divisors is an integer number (8529807).

Almost surely, 2^28432685 is an apocalyptic number.

It is an amenable number.

28432685 is a deficient number, since it is larger than the sum of its proper divisors (5686543).

28432685 is an equidigital number, since it uses as much as digits as its factorization.

28432685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5686542.

The product of its digits is 92160, while the sum is 38.

The square root of 28432685 is about 5332.2307714502. The cubic root of 28432685 is about 305.2150592882.

The spelling of 28432685 in words is "twenty-eight million, four hundred thirty-two thousand, six hundred eighty-five".