72745523 has 4 divisors (see below), whose sum is σ = 72919560. Its totient is φ = 72571488.

The previous prime is 72745459. The next prime is 72745549. The reversal of 72745523 is 32554727.

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

It is a cyclic number.

It is not a de Polignac number, because 72745523 - 2⁶ = 72745459 is a prime.

It is a super-2 number, since 2×72745523² = 10583822233087058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72745583) 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, 86390 + ... + 87227.

It is an arithmetic number, because the mean of its divisors is an integer number (18229890).

Almost surely, 2^72745523 is an apocalyptic number.

72745523 is a deficient number, since it is larger than the sum of its proper divisors (174037).

72745523 is a wasteful number, since it uses less digits than its factorization.

72745523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174036.

The product of its digits is 58800, while the sum is 35.

The square root of 72745523 is about 8529.0986041902. The cubic root of 72745523 is about 417.4477169281.

The spelling of 72745523 in words is "seventy-two million, seven hundred forty-five thousand, five hundred twenty-three".