27057781 has 2 divisors, whose sum is σ = 27057782. Its totient is φ = 27057780.

The previous prime is 27057773. The next prime is 27057787. The reversal of 27057781 is 18775072.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26471025 + 586756 = 5145^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 27057781 - 2³ = 27057773 is a prime.

It is a super-2 number, since 2×27057781² = 1464247025287922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27057781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27057787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13528890 + 13528891.

It is an arithmetic number, because the mean of its divisors is an integer number (13528891).

Almost surely, 2^27057781 is an apocalyptic number.

It is an amenable number.

27057781 is a deficient number, since it is larger than the sum of its proper divisors (1).

27057781 is an equidigital number, since it uses as much as digits as its factorization.

27057781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 27057781 is about 5201.7094305622. The cubic root of 27057781 is about 300.2138512263.

The spelling of 27057781 in words is "twenty-seven million, fifty-seven thousand, seven hundred eighty-one".