72044513 has 4 divisors (see below), whose sum is σ = 73991700. Its totient is φ = 70097328.

The previous prime is 72044507. The next prime is 72044551. The reversal of 72044513 is 31544027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31544027 = 17 ⋅1855531.

It can be written as a sum of positive squares in 2 ways, for example, as 34492129 + 37552384 = 5873^2 + 6128^2 .

It is a cyclic number.

It is not a de Polignac number, because 72044513 - 2¹⁸ = 71782369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72044563) 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, 973538 + ... + 973611.

It is an arithmetic number, because the mean of its divisors is an integer number (18497925).

Almost surely, 2^72044513 is an apocalyptic number.

It is an amenable number.

72044513 is a deficient number, since it is larger than the sum of its proper divisors (1947187).

72044513 is a wasteful number, since it uses less digits than its factorization.

72044513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947186.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 72044513 is about 8487.9039226419. The cubic root of 72044513 is about 416.1024791444.

The spelling of 72044513 in words is "seventy-two million, forty-four thousand, five hundred thirteen".