72851993 has 2 divisors, whose sum is σ = 72851994. Its totient is φ = 72851992.

The previous prime is 72851969. The next prime is 72852011. The reversal of 72851993 is 39915827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69272329 + 3579664 = 8323^2 + 1892^2 .

It is a cyclic number.

It is not a de Polignac number, because 72851993 - 2¹⁰ = 72850969 is a prime.

It is not a weakly prime, because it can be changed into another prime (72851963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36425996 + 36425997.

It is an arithmetic number, because the mean of its divisors is an integer number (36425997).

Almost surely, 2^72851993 is an apocalyptic number.

It is an amenable number.

72851993 is a deficient number, since it is larger than the sum of its proper divisors (1).

72851993 is an equidigital number, since it uses as much as digits as its factorization.

72851993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 72851993 is about 8535.3378960648. The cubic root of 72851993 is about 417.6512758127.

The spelling of 72851993 in words is "seventy-two million, eight hundred fifty-one thousand, nine hundred ninety-three".