72097523 has 4 divisors (see below), whose sum is σ = 72227520. Its totient is φ = 71967528.

The previous prime is 72097507. The next prime is 72097573. The reversal of 72097523 is 32579027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32579027 = 13 ⋅2506079.

It is a cyclic number.

It is not a de Polignac number, because 72097523 - 2⁴ = 72097507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72097573) 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, 64163 + ... + 65276.

It is an arithmetic number, because the mean of its divisors is an integer number (18056880).

Almost surely, 2^72097523 is an apocalyptic number.

72097523 is a deficient number, since it is larger than the sum of its proper divisors (129997).

72097523 is a wasteful number, since it uses less digits than its factorization.

72097523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129996.

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 72097523 is about 8491.0260275187. The cubic root of 72097523 is about 416.2045095131.

The spelling of 72097523 in words is "seventy-two million, ninety-seven thousand, five hundred twenty-three".