68643073 has 4 divisors (see below), whose sum is σ = 68659668. Its totient is φ = 68626480.

The previous prime is 68643053. The next prime is 68643089. The reversal of 68643073 is 37034686.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5726449 + 62916624 = 2393^2 + 7932^2 .

It is a cyclic number.

It is not a de Polignac number, because 68643073 - 2¹⁷ = 68512001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68643053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3483 + ... + 12223.

It is an arithmetic number, because the mean of its divisors is an integer number (17164917).

Almost surely, 2^68643073 is an apocalyptic number.

It is an amenable number.

68643073 is a deficient number, since it is larger than the sum of its proper divisors (16595).

68643073 is an equidigital number, since it uses as much as digits as its factorization.

68643073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16594.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 68643073 is about 8285.1115261051. Note that the first 3 decimals coincide. The cubic root of 68643073 is about 409.4481431221.

The spelling of 68643073 in words is "sixty-eight million, six hundred forty-three thousand, seventy-three".