72144249 has 4 divisors (see below), whose sum is σ = 96192336. Its totient is φ = 48096164.

The previous prime is 72144217. The next prime is 72144251. The reversal of 72144249 is 94244127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94244127 = 3 ⋅31414709.

It is a cyclic number.

It is not a de Polignac number, because 72144249 - 2⁵ = 72144217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72144299) 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, 12024039 + ... + 12024044.

It is an arithmetic number, because the mean of its divisors is an integer number (24048084).

Almost surely, 2^72144249 is an apocalyptic number.

It is an amenable number.

72144249 is a deficient number, since it is larger than the sum of its proper divisors (24048087).

72144249 is a wasteful number, since it uses less digits than its factorization.

72144249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24048086.

The product of its digits is 16128, while the sum is 33.

The square root of 72144249 is about 8493.7770750120. Note that the first 3 decimals coincide. The cubic root of 72144249 is about 416.2944033649.

The spelling of 72144249 in words is "seventy-two million, one hundred forty-four thousand, two hundred forty-nine".