72319718 has 4 divisors (see below), whose sum is σ = 108479580. Its totient is φ = 36159858.

The previous prime is 72319711. The next prime is 72319721. The reversal of 72319718 is 81791327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81791327 = 47 ⋅1740241.

It is a super-2 number, since 2×72319718² = 10460283223199048, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72319711) 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 as a sum of consecutive naturals, namely, 18079928 + ... + 18079931.

It is an arithmetic number, because the mean of its divisors is an integer number (27119895).

Almost surely, 2^72319718 is an apocalyptic number.

72319718 is a deficient number, since it is larger than the sum of its proper divisors (36159862).

72319718 is a wasteful number, since it uses less digits than its factorization.

72319718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36159861.

The product of its digits is 21168, while the sum is 38.

The square root of 72319718 is about 8504.1000699663. The cubic root of 72319718 is about 416.6316333923.

It can be divided in two parts, 72319 and 718, that added together give a palindrome (73037).

The spelling of 72319718 in words is "seventy-two million, three hundred nineteen thousand, seven hundred eighteen".