72729523 has 4 divisors (see below), whose sum is σ = 72792288. Its totient is φ = 72666760.

The previous prime is 72729521. The next prime is 72729529. The reversal of 72729523 is 32592727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32592727 = 61 ⋅534307.

It is a cyclic number.

It is not a de Polignac number, because 72729523 - 2¹ = 72729521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72729521) 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, 29611 + ... + 31972.

It is an arithmetic number, because the mean of its divisors is an integer number (18198072).

Almost surely, 2^72729523 is an apocalyptic number.

72729523 is a deficient number, since it is larger than the sum of its proper divisors (62765).

72729523 is a wasteful number, since it uses less digits than its factorization.

72729523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62764.

The product of its digits is 52920, while the sum is 37.

The square root of 72729523 is about 8528.1605871372. The cubic root of 72729523 is about 417.4171095316.

The spelling of 72729523 in words is "seventy-two million, seven hundred twenty-nine thousand, five hundred twenty-three".