73445581 has 4 divisors (see below), whose sum is σ = 80122464. Its totient is φ = 66768700.

The previous prime is 73445579. The next prime is 73445599. The reversal of 73445581 is 18554437.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 73445581 - 2¹ = 73445579 is a prime.

It is a super-2 number, since 2×73445581² = 10788506736855122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 73445581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73445521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3338425 + ... + 3338446.

It is an arithmetic number, because the mean of its divisors is an integer number (20030616).

Almost surely, 2^73445581 is an apocalyptic number.

It is an amenable number.

73445581 is a deficient number, since it is larger than the sum of its proper divisors (6676883).

73445581 is a wasteful number, since it uses less digits than its factorization.

73445581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6676882.

The product of its digits is 67200, while the sum is 37.

The square root of 73445581 is about 8570.0397315298. The cubic root of 73445581 is about 418.7825305982.

The spelling of 73445581 in words is "seventy-three million, four hundred forty-five thousand, five hundred eighty-one".