72919723 has 4 divisors (see below), whose sum is σ = 73136440. Its totient is φ = 72703008.

The previous prime is 72919703. The next prime is 72919741. The reversal of 72919723 is 32791927.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72919723 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (72919703) 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, 107853 + ... + 108526.

It is an arithmetic number, because the mean of its divisors is an integer number (18284110).

Almost surely, 2^72919723 is an apocalyptic number.

72919723 is a deficient number, since it is larger than the sum of its proper divisors (216717).

72919723 is a wasteful number, since it uses less digits than its factorization.

72919723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216716.

The product of its digits is 47628, while the sum is 40.

The square root of 72919723 is about 8539.3045969798. The cubic root of 72919723 is about 417.7806649025.

The spelling of 72919723 in words is "seventy-two million, nine hundred nineteen thousand, seven hundred twenty-three".