73436521 has 8 divisors (see below), whose sum is σ = 74180520. Its totient is φ = 72695808.

The previous prime is 73436509. The next prime is 73436557. The reversal of 73436521 is 12563437.

It can be written as a sum of positive squares in 4 ways, for example, as 14745600 + 58690921 = 3840^2 + 7661^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73436521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73436591) 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 7 ways as a sum of consecutive naturals, for example, 78585 + ... + 79513.

It is an arithmetic number, because the mean of its divisors is an integer number (9272565).

Almost surely, 2^73436521 is an apocalyptic number.

It is an amenable number.

73436521 is a deficient number, since it is larger than the sum of its proper divisors (743999).

73436521 is a wasteful number, since it uses less digits than its factorization.

73436521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643.

The product of its digits is 15120, while the sum is 31.

The square root of 73436521 is about 8569.5111295803. The cubic root of 73436521 is about 418.7653100217.

Adding to 73436521 its reverse (12563437), we get a palindrome (85999958).

The spelling of 73436521 in words is "seventy-three million, four hundred thirty-six thousand, five hundred twenty-one".