72118724 has 12 divisors (see below), whose sum is σ = 127509564. Its totient is φ = 35687424.

The previous prime is 72118693. The next prime is 72118729. The reversal of 72118724 is 42781127.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 40960000 + 31158724 = 6400^2 + 5582^2 .

It is a super-2 number, since 2×72118724² = 10402220702776352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72118729) 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 3 ways as a sum of consecutive naturals, for example, 92549 + ... + 93324.

It is an arithmetic number, because the mean of its divisors is an integer number (10625797).

Almost surely, 2^72118724 is an apocalyptic number.

It is an amenable number.

72118724 is a deficient number, since it is larger than the sum of its proper divisors (55390840).

72118724 is a wasteful number, since it uses less digits than its factorization.

72118724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185974 (or 185972 counting only the distinct ones).

The product of its digits is 6272, while the sum is 32.

The square root of 72118724 is about 8492.2743714508. The cubic root of 72118724 is about 416.2453018855.

The spelling of 72118724 in words is "seventy-two million, one hundred eighteen thousand, seven hundred twenty-four".