72126616 has 16 divisors (see below), whose sum is σ = 138893040. Its totient is φ = 35088480.

The previous prime is 72126601. The next prime is 72126617. The reversal of 72126616 is 61662127.

It is a happy number.

It is a super-2 number, since 2×72126616² = 10404497471222912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72126617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121540 + ... + 122131.

It is an arithmetic number, because the mean of its divisors is an integer number (8680815).

Almost surely, 2^72126616 is an apocalyptic number.

It is an amenable number.

72126616 is a deficient number, since it is larger than the sum of its proper divisors (66766424).

72126616 is a wasteful number, since it uses less digits than its factorization.

72126616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243714 (or 243710 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 72126616 is about 8492.7390163598. The cubic root of 72126616 is about 416.2604846653.

The spelling of 72126616 in words is "seventy-two million, one hundred twenty-six thousand, six hundred sixteen".