73661593 has 4 divisors (see below), whose sum is σ = 73826100. Its totient is φ = 73497088.

The previous prime is 73661591. The next prime is 73661603. The reversal of 73661593 is 39516637.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39516637 = 19 ⋅2079823.

It can be written as a sum of positive squares in 2 ways, for example, as 62047129 + 11614464 = 7877^2 + 3408^2 .

It is a cyclic number.

It is not a de Polignac number, because 73661593 - 2¹ = 73661591 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 not an unprimeable number, because it can be changed into a prime (73661591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81580 + ... + 82477.

It is an arithmetic number, because the mean of its divisors is an integer number (18456525).

Almost surely, 2^73661593 is an apocalyptic number.

It is an amenable number.

73661593 is a deficient number, since it is larger than the sum of its proper divisors (164507).

73661593 is a wasteful number, since it uses less digits than its factorization.

73661593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164506.

The product of its digits is 102060, while the sum is 40.

The square root of 73661593 is about 8582.6332206381. The cubic root of 73661593 is about 419.1926914680.

The spelling of 73661593 in words is "seventy-three million, six hundred sixty-one thousand, five hundred ninety-three".