73436561 has 16 divisors (see below), whose sum is σ = 82798848. Its totient is φ = 64554000.

The previous prime is 73436557. The next prime is 73436563. The reversal of 73436561 is 16563437.

It is a cyclic number.

It is not a de Polignac number, because 73436561 - 2² = 73436557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73436563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49886 + ... + 51336.

It is an arithmetic number, because the mean of its divisors is an integer number (5174928).

Almost surely, 2^73436561 is an apocalyptic number.

It is an amenable number.

73436561 is a deficient number, since it is larger than the sum of its proper divisors (9362287).

73436561 is a wasteful number, since it uses less digits than its factorization.

73436561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612.

The product of its digits is 45360, while the sum is 35.

The square root of 73436561 is about 8569.5134634354. The cubic root of 73436561 is about 418.7653860538.

Adding to 73436561 its reverse (16563437), we get a palindrome (89999998).

It can be divided in two parts, 73 and 436561, that added together give a palindrome (436634).

The spelling of 73436561 in words is "seventy-three million, four hundred thirty-six thousand, five hundred sixty-one".