27728453 has 4 divisors (see below), whose sum is σ = 27914700. Its totient is φ = 27542208.

The previous prime is 27728431. The next prime is 27728473. The reversal of 27728453 is 35482772.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8076964 + 19651489 = 2842^2 + 4433^2 .

It is a cyclic number.

It is not a de Polignac number, because 27728453 - 2¹² = 27724357 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 (27728413) 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, 92900 + ... + 93197.

It is an arithmetic number, because the mean of its divisors is an integer number (6978675).

Almost surely, 2^27728453 is an apocalyptic number.

It is an amenable number.

27728453 is a deficient number, since it is larger than the sum of its proper divisors (186247).

27728453 is a wasteful number, since it uses less digits than its factorization.

27728453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186246.

The product of its digits is 94080, while the sum is 38.

The square root of 27728453 is about 5265.7813285400. The cubic root of 27728453 is about 302.6740677926.

The spelling of 27728453 in words is "twenty-seven million, seven hundred twenty-eight thousand, four hundred fifty-three".