73161640 has 16 divisors (see below), whose sum is σ = 164613780. Its totient is φ = 29264640.

The previous prime is 73161637. The next prime is 73161653. The reversal of 73161640 is 4616137.

It can be written as a sum of positive squares in 2 ways, for example, as 72897444 + 264196 = 8538^2 + 514^2 .

It is a junction number, because it is equal to n+sod(n) for n = 73161599 and 73161608.

It is an unprimeable number.

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, 914481 + ... + 914560.

Almost surely, 2^73161640 is an apocalyptic number.

It is an amenable number.

73161640 is an abundant number, since it is smaller than the sum of its proper divisors (91452140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

73161640 is a wasteful number, since it uses less digits than its factorization.

73161640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829052 (or 1829048 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 73161640 is about 8553.4577803366. The cubic root of 73161640 is about 418.2421618253.

Adding to 73161640 its reverse (4616137), we get a palindrome (77777777).

The spelling of 73161640 in words is "seventy-three million, one hundred sixty-one thousand, six hundred forty".