27731428 has 6 divisors (see below), whose sum is σ = 48530006. Its totient is φ = 13865712.

The previous prime is 27731423. The next prime is 27731441. The reversal of 27731428 is 82413772.

It can be written as a sum of positive squares in only one way, i.e., 27373824 + 357604 = 5232^2 + 598^2 .

It is a junction number, because it is equal to n+sod(n) for n = 27731393 and 27731402.

It is not an unprimeable number, because it can be changed into a prime (27731423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3466425 + ... + 3466432.

Almost surely, 2^27731428 is an apocalyptic number.

It is an amenable number.

27731428 is a deficient number, since it is larger than the sum of its proper divisors (20798578).

27731428 is a wasteful number, since it uses less digits than its factorization.

27731428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6932861 (or 6932859 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 27731428 is about 5266.0638051585. The cubic root of 27731428 is about 302.6848920910.

The spelling of 27731428 in words is "twenty-seven million, seven hundred thirty-one thousand, four hundred twenty-eight".