72423320 has 32 divisors (see below), whose sum is σ = 170039520. Its totient is φ = 27709440.

The previous prime is 72423313. The next prime is 72423331. The reversal of 72423320 is 2332427.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38441 + ... + 40280.

It is an arithmetic number, because the mean of its divisors is an integer number (5313735).

Almost surely, 2^72423320 is an apocalyptic number.

It is an amenable number.

72423320 is an abundant number, since it is smaller than the sum of its proper divisors (97616200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72423320 is a wasteful number, since it uses less digits than its factorization.

72423320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78755 (or 78751 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 23.

The square root of 72423320 is about 8510.1891870863. The cubic root of 72423320 is about 416.8304877597.

Adding to 72423320 its reverse (2332427), we get a palindrome (74755747).

The spelling of 72423320 in words is "seventy-two million, four hundred twenty-three thousand, three hundred twenty".