28089447 has 8 divisors (see below), whose sum is σ = 37641600. Its totient is φ = 18631800.

The previous prime is 28089443. The next prime is 28089461. The reversal of 28089447 is 74498082.

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

It is not a de Polignac number, because 28089447 - 2² = 28089443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28089399 and 28089408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28089443) 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, 22929 + ... + 24122.

It is an arithmetic number, because the mean of its divisors is an integer number (4705200).

Almost surely, 2^28089447 is an apocalyptic number.

28089447 is a deficient number, since it is larger than the sum of its proper divisors (9552153).

28089447 is a wasteful number, since it uses less digits than its factorization.

28089447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47253.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 28089447 is about 5299.9478299319. The cubic root of 28089447 is about 303.9819032106.

The spelling of 28089447 in words is "twenty-eight million, eighty-nine thousand, four hundred forty-seven".