27728789 has 8 divisors (see below), whose sum is σ = 30365280. Its totient is φ = 25111600.

The previous prime is 27728773. The next prime is 27728797. The reversal of 27728789 is 98782772.

27728789 = T₁₂ + T₁₃ + ... + T₅₄₉.

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 27728789 - 2⁴ = 27728773 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27728719) 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, 1727 + ... + 7644.

It is an arithmetic number, because the mean of its divisors is an integer number (3795660).

Almost surely, 2^27728789 is an apocalyptic number.

It is an amenable number.

27728789 is a deficient number, since it is larger than the sum of its proper divisors (2636491).

27728789 is a wasteful number, since it uses less digits than its factorization.

27728789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9651.

The product of its digits is 790272, while the sum is 50.

The square root of 27728789 is about 5265.8132325406. The cubic root of 27728789 is about 302.6752903404.

The spelling of 27728789 in words is "twenty-seven million, seven hundred twenty-eight thousand, seven hundred eighty-nine".