38764707781 has 2 divisors, whose sum is σ = 38764707782. Its totient is φ = 38764707780.

The previous prime is 38764707767. The next prime is 38764707841. The reversal of 38764707781 is 18770746783.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32315814756 + 6448893025 = 179766^2 + 80305^2 .

It is a cyclic number.

It is not a de Polignac number, because 38764707781 - 2⁵ = 38764707749 is a prime.

It is a super-2 number, since 2×38764707781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38764707701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19382353890 + 19382353891.

It is an arithmetic number, because the mean of its divisors is an integer number (19382353891).

Almost surely, 2^38764707781 is an apocalyptic number.

It is an amenable number.

38764707781 is a deficient number, since it is larger than the sum of its proper divisors (1).

38764707781 is an equidigital number, since it uses as much as digits as its factorization.

38764707781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11063808, while the sum is 58.

The spelling of 38764707781 in words is "thirty-eight billion, seven hundred sixty-four million, seven hundred seven thousand, seven hundred eighty-one".