28493687 has 4 divisors (see below), whose sum is σ = 28578576. Its totient is φ = 28408800.

The previous prime is 28493659. The next prime is 28493713. The reversal of 28493687 is 78639482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28493687 - 2⁸ = 28493431 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 (28493627) 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, 41939 + ... + 42612.

It is an arithmetic number, because the mean of its divisors is an integer number (7144644).

Almost surely, 2^28493687 is an apocalyptic number.

28493687 is a deficient number, since it is larger than the sum of its proper divisors (84889).

28493687 is an equidigital number, since it uses as much as digits as its factorization.

28493687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84888.

The product of its digits is 580608, while the sum is 47.

The square root of 28493687 is about 5337.9478266465. The cubic root of 28493687 is about 305.4331818406.

The spelling of 28493687 in words is "twenty-eight million, four hundred ninety-three thousand, six hundred eighty-seven".