28432693 has 4 divisors (see below), whose sum is σ = 28444108. Its totient is φ = 28421280.

The previous prime is 28432661. The next prime is 28432699. The reversal of 28432693 is 39623482.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3602404 + 24830289 = 1898^2 + 4983^2 .

It is a cyclic number.

It is not a de Polignac number, because 28432693 - 2⁵ = 28432661 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 (28432699) 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, 198 + ... + 7543.

It is an arithmetic number, because the mean of its divisors is an integer number (7111027).

Almost surely, 2^28432693 is an apocalyptic number.

It is an amenable number.

28432693 is a deficient number, since it is larger than the sum of its proper divisors (11415).

28432693 is an equidigital number, since it uses as much as digits as its factorization.

28432693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11414.

The product of its digits is 62208, while the sum is 37.

The square root of 28432693 is about 5332.2315216052. The cubic root of 28432693 is about 305.2150879139.

The spelling of 28432693 in words is "twenty-eight million, four hundred thirty-two thousand, six hundred ninety-three".