72244751 has 4 divisors (see below), whose sum is σ = 72412032. Its totient is φ = 72077472.

The previous prime is 72244709. The next prime is 72244759. The reversal of 72244751 is 15744227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15744227 = 17 ⋅926131.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72244751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72244759) 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, 82991 + ... + 83856.

It is an arithmetic number, because the mean of its divisors is an integer number (18103008).

Almost surely, 2^72244751 is an apocalyptic number.

72244751 is a deficient number, since it is larger than the sum of its proper divisors (167281).

72244751 is a wasteful number, since it uses less digits than its factorization.

72244751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167280.

The product of its digits is 15680, while the sum is 32.

The square root of 72244751 is about 8499.6912296859. The cubic root of 72244751 is about 416.4876227727.

Adding to 72244751 its reverse (15744227), we get a palindrome (87988978).

The spelling of 72244751 in words is "seventy-two million, two hundred forty-four thousand, seven hundred fifty-one".