67742813 has 2 divisors, whose sum is σ = 67742814. Its totient is φ = 67742812.

The previous prime is 67742789. The next prime is 67742827. The reversal of 67742813 is 31824776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67453369 + 289444 = 8213^2 + 538^2 .

It is a cyclic number.

It is not a de Polignac number, because 67742813 - 2⁶ = 67742749 is a prime.

It is a super-3 number, since 3×67742813³ (a number of 24 digits) contains 333 as substring.

It is a Sophie Germain 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 (67742833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33871406 + 33871407.

It is an arithmetic number, because the mean of its divisors is an integer number (33871407).

Almost surely, 2^67742813 is an apocalyptic number.

It is an amenable number.

67742813 is a deficient number, since it is larger than the sum of its proper divisors (1).

67742813 is an equidigital number, since it uses as much as digits as its factorization.

67742813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 38.

The square root of 67742813 is about 8230.6022258399. The cubic root of 67742813 is about 407.6502774181.

The spelling of 67742813 in words is "sixty-seven million, seven hundred forty-two thousand, eight hundred thirteen".