73040561 has 6 divisors (see below), whose sum is σ = 80284386. Its totient is φ = 66400400.

The previous prime is 73040537. The next prime is 73040563. The reversal of 73040561 is 16504037.

It can be written as a sum of positive squares in only one way, i.e., 61858225 + 11182336 = 7865^2 + 3344^2 .

It is not a de Polignac number, because 73040561 - 2¹⁰ = 73039537 is a prime.

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 73040561.

It is not an unprimeable number, because it can be changed into a prime (73040563) 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 5 ways as a sum of consecutive naturals, for example, 301700 + ... + 301941.

It is an arithmetic number, because the mean of its divisors is an integer number (13380731).

Almost surely, 2^73040561 is an apocalyptic number.

It is an amenable number.

73040561 is a deficient number, since it is larger than the sum of its proper divisors (7243825).

73040561 is a wasteful number, since it uses less digits than its factorization.

73040561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603663 (or 603652 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 73040561 is about 8546.3770686765. The cubic root of 73040561 is about 418.0113108666.

Adding to 73040561 its reverse (16504037), we get a palindrome (89544598).

The spelling of 73040561 in words is "seventy-three million, forty thousand, five hundred sixty-one".