68442757 has 2 divisors, whose sum is σ = 68442758. Its totient is φ = 68442756.

The previous prime is 68442743. The next prime is 68442767. The reversal of 68442757 is 75724486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54671236 + 13771521 = 7394^2 + 3711^2 .

It is a cyclic number.

It is not a de Polignac number, because 68442757 - 2¹⁹ = 67918469 is a prime.

It is a super-2 number, since 2×68442757² = 9368821971522098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68442727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34221378 + 34221379.

It is an arithmetic number, because the mean of its divisors is an integer number (34221379).

Almost surely, 2^68442757 is an apocalyptic number.

It is an amenable number.

68442757 is a deficient number, since it is larger than the sum of its proper divisors (1).

68442757 is an equidigital number, since it uses as much as digits as its factorization.

68442757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 376320, while the sum is 43.

The square root of 68442757 is about 8273.0137797540. The cubic root of 68442757 is about 409.0494676569.

The spelling of 68442757 in words is "sixty-eight million, four hundred forty-two thousand, seven hundred fifty-seven".