72120736 has 12 divisors (see below), whose sum is σ = 141987762. Its totient is φ = 36060352.

The previous prime is 72120721. The next prime is 72120739. The reversal of 72120736 is 63702127.

It can be written as a sum of positive squares in only one way, i.e., 58430736 + 13690000 = 7644^2 + 3700^2 .

It is a super-2 number, since 2×72120736² = 10402801122363392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72120739) 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 as a sum of consecutive naturals, namely, 1126855 + ... + 1126918.

Almost surely, 2^72120736 is an apocalyptic number.

It is an amenable number.

72120736 is a deficient number, since it is larger than the sum of its proper divisors (69867026).

72120736 is a wasteful number, since it uses less digits than its factorization.

72120736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2253783 (or 2253775 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 72120736 is about 8492.3928312343. The cubic root of 72120736 is about 416.2491727146.

The spelling of 72120736 in words is "seventy-two million, one hundred twenty thousand, seven hundred thirty-six".