68649761 has 2 divisors, whose sum is σ = 68649762. Its totient is φ = 68649760.

The previous prime is 68649743. The next prime is 68649769. The reversal of 68649761 is 16794686.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49561600 + 19088161 = 7040^2 + 4369^2 .

It is a cyclic number.

It is not a de Polignac number, because 68649761 - 2⁶ = 68649697 is a prime.

It is not a weakly prime, because it can be changed into another prime (68649769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34324880 + 34324881.

It is an arithmetic number, because the mean of its divisors is an integer number (34324881).

Almost surely, 2^68649761 is an apocalyptic number.

It is an amenable number.

68649761 is a deficient number, since it is larger than the sum of its proper divisors (1).

68649761 is an equidigital number, since it uses as much as digits as its factorization.

68649761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 68649761 is about 8285.5151318430. The cubic root of 68649761 is about 409.4614404107.

The spelling of 68649761 in words is "sixty-eight million, six hundred forty-nine thousand, seven hundred sixty-one".