72897245 has 4 divisors (see below), whose sum is σ = 87476700. Its totient is φ = 58317792.

The previous prime is 72897217. The next prime is 72897263. The reversal of 72897245 is 54279827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10582009 + 62315236 = 3253^2 + 7894^2 .

It is a cyclic number.

It is not a de Polignac number, because 72897245 - 2¹⁶ = 72831709 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72897196 and 72897205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7289720 + ... + 7289729.

It is an arithmetic number, because the mean of its divisors is an integer number (21869175).

Almost surely, 2^72897245 is an apocalyptic number.

It is an amenable number.

72897245 is a deficient number, since it is larger than the sum of its proper divisors (14579455).

72897245 is a wasteful number, since it uses less digits than its factorization.

72897245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14579454.

The product of its digits is 282240, while the sum is 44.

The square root of 72897245 is about 8537.9883462090. The cubic root of 72897245 is about 417.7377325814.

The spelling of 72897245 in words is "seventy-two million, eight hundred ninety-seven thousand, two hundred forty-five".