69727681 has 2 divisors, whose sum is σ = 69727682. Its totient is φ = 69727680.

The previous prime is 69727661. The next prime is 69727709. The reversal of 69727681 is 18672796.

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., 66178225 + 3549456 = 8135^2 + 1884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69727681 is a prime.

It is a super-2 number, since 2×69727681² = 9723898995275522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (69727631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34863840 + 34863841.

It is an arithmetic number, because the mean of its divisors is an integer number (34863841).

Almost surely, 2^69727681 is an apocalyptic number.

It is an amenable number.

69727681 is a deficient number, since it is larger than the sum of its proper divisors (1).

69727681 is an equidigital number, since it uses as much as digits as its factorization.

69727681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 46.

The square root of 69727681 is about 8350.3102337578. The cubic root of 69727681 is about 411.5934048374.

The spelling of 69727681 in words is "sixty-nine million, seven hundred twenty-seven thousand, six hundred eighty-one".