28494452809 has 3 divisors (see below), whose sum is σ = 28494621613. Its totient is φ = 28494284006.

The previous prime is 28494452803. The next prime is 28494452827. The reversal of 28494452809 is 90825449482.

The square root of 28494452809 is 168803.

It is a perfect power (a square), and thus also a powerful number.

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 is not a de Polignac number, because 28494452809 - 2⁹ = 28494452297 is a prime.

It is a super-3 number, since 3×28494452809³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28494452809.

It is not an unprimeable number, because it can be changed into a prime (28494452803) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 84402 + ... + 253204.

Almost surely, 2^28494452809 is an apocalyptic number.

28494452809 is the 168803-rd square number.

28494452809 is the 84402-nd centered octagonal number.

It is an amenable number.

28494452809 is a deficient number, since it is larger than the sum of its proper divisors (168804).

28494452809 is an frugal number, since it uses more digits than its factorization.

28494452809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337606 (or 168803 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 55.

The spelling of 28494452809 in words is "twenty-eight billion, four hundred ninety-four million, four hundred fifty-two thousand, eight hundred nine".