73539643 has 2 divisors, whose sum is σ = 73539644. Its totient is φ = 73539642.

The previous prime is 73539611. The next prime is 73539647. The reversal of 73539643 is 34693537.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 73539643 - 2⁵ = 73539611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 73539596 and 73539605.

It is not a weakly prime, because it can be changed into another prime (73539647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36769821 + 36769822.

It is an arithmetic number, because the mean of its divisors is an integer number (36769822).

Almost surely, 2^73539643 is an apocalyptic number.

73539643 is a deficient number, since it is larger than the sum of its proper divisors (1).

73539643 is an equidigital number, since it uses as much as digits as its factorization.

73539643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 40.

The square root of 73539643 is about 8575.5258147824. The cubic root of 73539643 is about 418.9612330585.

The spelling of 73539643 in words is "seventy-three million, five hundred thirty-nine thousand, six hundred forty-three".