71673493 has 4 divisors (see below), whose sum is σ = 71690508. Its totient is φ = 71656480.

The previous prime is 71673487. The next prime is 71673521. The reversal of 71673493 is 39437617.

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 33258289 + 38415204 = 5767^2 + 6198^2 .

It is a cyclic number.

It is not a de Polignac number, because 71673493 - 2⁹ = 71672981 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71673463) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3003 + ... + 12343.

It is an arithmetic number, because the mean of its divisors is an integer number (17922627).

It is a vampire number, since it can be written as 7673 ⋅ 9341 (with its own digits).

Almost surely, 2^71673493 is an apocalyptic number.

It is an amenable number.

71673493 is a deficient number, since it is larger than the sum of its proper divisors (17015).

71673493 is an equidigital number, since it uses as much as digits as its factorization.

71673493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17014.

The product of its digits is 95256, while the sum is 40.

The square root of 71673493 is about 8466.0199031186. The cubic root of 71673493 is about 415.3869579913.

The spelling of 71673493 in words is "seventy-one million, six hundred seventy-three thousand, four hundred ninety-three".