67769381 has 2 divisors, whose sum is σ = 67769382. Its totient is φ = 67769380.

The previous prime is 67769363. The next prime is 67769389. The reversal of 67769381 is 18396776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67732900 + 36481 = 8230^2 + 191^2 .

It is a cyclic number.

It is not a de Polignac number, because 67769381 - 2¹⁰ = 67768357 is a prime.

It is a super-2 number, since 2×67769381² = 9185378002246322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67769389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33884690 + 33884691.

It is an arithmetic number, because the mean of its divisors is an integer number (33884691).

Almost surely, 2^67769381 is an apocalyptic number.

It is an amenable number.

67769381 is a deficient number, since it is larger than the sum of its proper divisors (1).

67769381 is an equidigital number, since it uses as much as digits as its factorization.

67769381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 67769381 is about 8232.2160442982. The cubic root of 67769381 is about 407.7035624655.

The spelling of 67769381 in words is "sixty-seven million, seven hundred sixty-nine thousand, three hundred eighty-one".