67138769 has 2 divisors, whose sum is σ = 67138770. Its totient is φ = 67138768.

The previous prime is 67138759. The next prime is 67138787. The reversal of 67138769 is 96783176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63808144 + 3330625 = 7988^2 + 1825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67138769 is a prime.

It is a super-2 number, since 2×67138769² = 9015228605670722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67138739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33569384 + 33569385.

It is an arithmetic number, because the mean of its divisors is an integer number (33569385).

Almost surely, 2^67138769 is an apocalyptic number.

It is an amenable number.

67138769 is a deficient number, since it is larger than the sum of its proper divisors (1).

67138769 is an equidigital number, since it uses as much as digits as its factorization.

67138769 is an odious number, because the sum of its binary digits is odd.

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

The square root of 67138769 is about 8193.8250530506. The cubic root of 67138769 is about 406.4350231283.

The spelling of 67138769 in words is "sixty-seven million, one hundred thirty-eight thousand, seven hundred sixty-nine".