27728775 has 18 divisors (see below), whose sum is σ = 49665720. Its totient is φ = 14788560.

The previous prime is 27728773. The next prime is 27728797. The reversal of 27728775 is 57782772.

It is a happy number.

It is not a de Polignac number, because 27728775 - 2¹ = 27728773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 27728775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27728773) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 61395 + ... + 61844.

Almost surely, 2^27728775 is an apocalyptic number.

27728775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

27728775 is a deficient number, since it is larger than the sum of its proper divisors (21936945).

27728775 is a wasteful number, since it uses less digits than its factorization.

27728775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123255 (or 123247 counting only the distinct ones).

The product of its digits is 384160, while the sum is 45.

The square root of 27728775 is about 5265.8119032111. The cubic root of 27728775 is about 302.6752394011.

The spelling of 27728775 in words is "twenty-seven million, seven hundred twenty-eight thousand, seven hundred seventy-five".