72144272 has 10 divisors (see below), whose sum is σ = 139779558. Its totient is φ = 36072128.

The previous prime is 72144263. The next prime is 72144283. The reversal of 72144272 is 27244127.

It can be written as a sum of positive squares in only one way, i.e., 36192256 + 35952016 = 6016^2 + 5996^2 .

It is a super-4 number, since 4×72144272⁴ (a number of 33 digits) contains 4444 as substring.

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 as a sum of consecutive naturals, namely, 2254493 + ... + 2254524.

Almost surely, 2^72144272 is an apocalyptic number.

It is an amenable number.

72144272 is a deficient number, since it is larger than the sum of its proper divisors (67635286).

72144272 is a wasteful number, since it uses less digits than its factorization.

72144272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4509025 (or 4509019 counting only the distinct ones).

The product of its digits is 6272, while the sum is 29.

The square root of 72144272 is about 8493.7784289443. The cubic root of 72144272 is about 416.2944476039.

Adding to 72144272 its reverse (27244127), we get a palindrome (99388399).

The spelling of 72144272 in words is "seventy-two million, one hundred forty-four thousand, two hundred seventy-two".