73664473 has 2 divisors, whose sum is σ = 73664474. Its totient is φ = 73664472.

The previous prime is 73664453. The next prime is 73664497. The reversal of 73664473 is 37446637.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55234624 + 18429849 = 7432^2 + 4293^2 .

It is an emirp because it is prime and its reverse (37446637) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73664473 - 2²⁵ = 40110041 is a prime.

It is not a weakly prime, because it can be changed into another prime (73664443) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36832236 + 36832237.

It is an arithmetic number, because the mean of its divisors is an integer number (36832237).

Almost surely, 2^73664473 is an apocalyptic number.

It is an amenable number.

73664473 is a deficient number, since it is larger than the sum of its proper divisors (1).

73664473 is an equidigital number, since it uses as much as digits as its factorization.

73664473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 40.

The square root of 73664473 is about 8582.8009996737. The cubic root of 73664473 is about 419.1981545556.

The spelling of 73664473 in words is "seventy-three million, six hundred sixty-four thousand, four hundred seventy-three".