37768681 has 2 divisors, whose sum is σ = 37768682. Its totient is φ = 37768680.

The previous prime is 37768651. The next prime is 37768693. The reversal of 37768681 is 18686773.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30151081 + 7617600 = 5491^2 + 2760^2 .

It is a cyclic number.

It is not a de Polignac number, because 37768681 - 2¹⁵ = 37735913 is a prime.

It is a super-2 number, since 2×37768681² = 2852946528959522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (37768631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18884340 + 18884341.

It is an arithmetic number, because the mean of its divisors is an integer number (18884341).

Almost surely, 2^37768681 is an apocalyptic number.

It is an amenable number.

37768681 is a deficient number, since it is larger than the sum of its proper divisors (1).

37768681 is an equidigital number, since it uses as much as digits as its factorization.

37768681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The square root of 37768681 is about 6145.6229139120. The cubic root of 37768681 is about 335.5139686038.

The spelling of 37768681 in words is "thirty-seven million, seven hundred sixty-eight thousand, six hundred eighty-one".