28293689 has 8 divisors (see below), whose sum is σ = 28693440. Its totient is φ = 27896656.

The previous prime is 28293673. The next prime is 28293697. The reversal of 28293689 is 98639282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28293689 - 2⁴ = 28293673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28293619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28292 + ... + 29274.

It is an arithmetic number, because the mean of its divisors is an integer number (3586680).

Almost surely, 2^28293689 is an apocalyptic number.

It is an amenable number.

28293689 is a deficient number, since it is larger than the sum of its proper divisors (399751).

28293689 is a wasteful number, since it uses less digits than its factorization.

28293689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359.

The product of its digits is 373248, while the sum is 47.

The square root of 28293689 is about 5319.1812339871. The cubic root of 28293689 is about 304.7168885911.

It can be divided in two parts, 28293 and 689, that added together give a palindrome (28982).

The spelling of 28293689 in words is "twenty-eight million, two hundred ninety-three thousand, six hundred eighty-nine".