73644121 has 4 divisors (see below), whose sum is σ = 73930932. Its totient is φ = 73357312.

The previous prime is 73644113. The next prime is 73644143. The reversal of 73644121 is 12144637.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47265625 + 26378496 = 6875^2 + 5136^2 .

It is a cyclic number.

It is not a de Polignac number, because 73644121 - 2³ = 73644113 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 73644121.

It is not an unprimeable number, because it can be changed into a prime (73644101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143020 + ... + 143533.

It is an arithmetic number, because the mean of its divisors is an integer number (18482733).

Almost surely, 2^73644121 is an apocalyptic number.

It is an amenable number.

73644121 is a deficient number, since it is larger than the sum of its proper divisors (286811).

73644121 is a wasteful number, since it uses less digits than its factorization.

73644121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286810.

The product of its digits is 4032, while the sum is 28.

The square root of 73644121 is about 8581.6152908412. The cubic root of 73644121 is about 419.1595456835.

Adding to 73644121 its reverse (12144637), we get a palindrome (85788758).

The spelling of 73644121 in words is "seventy-three million, six hundred forty-four thousand, one hundred twenty-one".