73736561 has 8 divisors (see below), whose sum is σ = 75463680. Its totient is φ = 72016128.

The previous prime is 73736557. The next prime is 73736563. The reversal of 73736561 is 16563737.

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

It is a cyclic number.

It is not a de Polignac number, because 73736561 - 2² = 73736557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73736563) 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, 25760 + ... + 28478.

It is an arithmetic number, because the mean of its divisors is an integer number (9432960).

Almost surely, 2^73736561 is an apocalyptic number.

It is an amenable number.

73736561 is a deficient number, since it is larger than the sum of its proper divisors (1727119).

73736561 is a wasteful number, since it uses less digits than its factorization.

73736561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3343.

The product of its digits is 79380, while the sum is 38.

The square root of 73736561 is about 8586.9995341796. Note that the first 3 decimals coincide. The cubic root of 73736561 is about 419.3348523115.

The spelling of 73736561 in words is "seventy-three million, seven hundred thirty-six thousand, five hundred sixty-one".