27531728 has 30 divisors (see below), whose sum is σ = 62053506. Its totient is φ = 11798976.

The previous prime is 27531727. The next prime is 27531743. The reversal of 27531728 is 82713572.

It can be written as a sum of positive squares in only one way, i.e., 14077504 + 13454224 = 3752^2 + 3668^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27531727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16775 + ... + 18342.

Almost surely, 2^27531728 is an apocalyptic number.

27531728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

27531728 is an abundant number, since it is smaller than the sum of its proper divisors (34521778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27531728 is a wasteful number, since it uses less digits than its factorization.

27531728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35139 (or 35126 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 27531728 is about 5247.0685148948. The cubic root of 27531728 is about 301.9565746078.

The spelling of 27531728 in words is "twenty-seven million, five hundred thirty-one thousand, seven hundred twenty-eight".