72512705 has 4 divisors (see below), whose sum is σ = 87015252. Its totient is φ = 58010160.

The previous prime is 72512659. The next prime is 72512707. The reversal of 72512705 is 50721527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50721527 = 607 ⋅83561.

It can be written as a sum of positive squares in 2 ways, for example, as 14691889 + 57820816 = 3833^2 + 7604^2 .

It is not a de Polignac number, because 72512705 - 2¹² = 72508609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72512707) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 7251266 + ... + 7251275.

It is an arithmetic number, because the mean of its divisors is an integer number (21753813).

Almost surely, 2^72512705 is an apocalyptic number.

It is an amenable number.

72512705 is a deficient number, since it is larger than the sum of its proper divisors (14502547).

72512705 is a wasteful number, since it uses less digits than its factorization.

72512705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14502546.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 72512705 is about 8515.4392135697. The cubic root of 72512705 is about 417.0019015876.

The spelling of 72512705 in words is "seventy-two million, five hundred twelve thousand, seven hundred five".