72107993 has 4 divisors (see below), whose sum is σ = 72976848. Its totient is φ = 71239140.

The previous prime is 72107989. The next prime is 72108073. The reversal of 72107993 is 39970127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39970127 = 5197 ⋅7691.

It is a cyclic number.

It is not a de Polignac number, because 72107993 - 2² = 72107989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72107393) 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, 434303 + ... + 434468.

It is an arithmetic number, because the mean of its divisors is an integer number (18244212).

Almost surely, 2^72107993 is an apocalyptic number.

It is an amenable number.

72107993 is a deficient number, since it is larger than the sum of its proper divisors (868855).

72107993 is an equidigital number, since it uses as much as digits as its factorization.

72107993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868854.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 72107993 is about 8491.6425384021. The cubic root of 72107993 is about 416.2246556065.

The spelling of 72107993 in words is "seventy-two million, one hundred seven thousand, nine hundred ninety-three".