72257723 has 4 divisors (see below), whose sum is σ = 72973248. Its totient is φ = 71542200.

The previous prime is 72257719. The next prime is 72257761. The reversal of 72257723 is 32775227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32775227 = 139 ⋅235793.

It is a cyclic number.

It is not a de Polignac number, because 72257723 - 2² = 72257719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72247723) by changing a digit.

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, 357611 + ... + 357812.

It is an arithmetic number, because the mean of its divisors is an integer number (18243312).

Almost surely, 2^72257723 is an apocalyptic number.

72257723 is a deficient number, since it is larger than the sum of its proper divisors (715525).

72257723 is a wasteful number, since it uses less digits than its factorization.

72257723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715524.

The product of its digits is 41160, while the sum is 35.

The square root of 72257723 is about 8500.4542819781. The cubic root of 72257723 is about 416.5125489393.

The spelling of 72257723 in words is "seventy-two million, two hundred fifty-seven thousand, seven hundred twenty-three".