72144247 has 8 divisors (see below), whose sum is σ = 82907552. Its totient is φ = 61495200.

The previous prime is 72144217. The next prime is 72144251. The reversal of 72144247 is 74244127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72144247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72144217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27204 + ... + 29737.

It is an arithmetic number, because the mean of its divisors is an integer number (10363444).

Almost surely, 2^72144247 is an apocalyptic number.

72144247 is a deficient number, since it is larger than the sum of its proper divisors (10763305).

72144247 is a wasteful number, since it uses less digits than its factorization.

72144247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57129.

The product of its digits is 12544, while the sum is 31.

The square root of 72144247 is about 8493.7769572788. The cubic root of 72144247 is about 416.2943995180.

The spelling of 72144247 in words is "seventy-two million, one hundred forty-four thousand, two hundred forty-seven".