72161612 has 12 divisors (see below), whose sum is σ = 127247736. Its totient is φ = 35805120.

The previous prime is 72161561. The next prime is 72161629. The reversal of 72161612 is 21616127.

It is a super-3 number, since 3×72161612³ (a number of 25 digits) contains 333 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 68333 + ... + 69380.

It is an arithmetic number, because the mean of its divisors is an integer number (10603978).

Almost surely, 2^72161612 is an apocalyptic number.

It is an amenable number.

72161612 is a deficient number, since it is larger than the sum of its proper divisors (55086124).

72161612 is a wasteful number, since it uses less digits than its factorization.

72161612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137848 (or 137846 counting only the distinct ones).

The product of its digits is 1008, while the sum is 26.

The square root of 72161612 is about 8494.7991147525. The cubic root of 72161612 is about 416.3277972946.

Adding to 72161612 its reverse (21616127), we get a palindrome (93777739).

The spelling of 72161612 in words is "seventy-two million, one hundred sixty-one thousand, six hundred twelve".