68624609 has 2 divisors, whose sum is σ = 68624610. Its totient is φ = 68624608.

The previous prime is 68624587. The next prime is 68624623. The reversal of 68624609 is 90642686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52998400 + 15626209 = 7280^2 + 3953^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68624609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (68624009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34312304 + 34312305.

It is an arithmetic number, because the mean of its divisors is an integer number (34312305).

Almost surely, 2^68624609 is an apocalyptic number.

It is an amenable number.

68624609 is a deficient number, since it is larger than the sum of its proper divisors (1).

68624609 is an equidigital number, since it uses as much as digits as its factorization.

68624609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 68624609 is about 8283.9971632057. The cubic root of 68624609 is about 409.4114279415.

The spelling of 68624609 in words is "sixty-eight million, six hundred twenty-four thousand, six hundred nine".