72721799 has 2 divisors, whose sum is σ = 72721800. Its totient is φ = 72721798.

The previous prime is 72721787. The next prime is 72721813. The reversal of 72721799 is 99712727.

It is a weak prime.

It is an emirp because it is prime and its reverse (99712727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72721799 - 2²⁰ = 71673223 is a prime.

It is a super-3 number, since 3×72721799³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72721709) 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, 36360899 + 36360900.

It is an arithmetic number, because the mean of its divisors is an integer number (36360900).

Almost surely, 2^72721799 is an apocalyptic number.

72721799 is a deficient number, since it is larger than the sum of its proper divisors (1).

72721799 is an equidigital number, since it uses as much as digits as its factorization.

72721799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 111132, while the sum is 44.

The square root of 72721799 is about 8527.7077224774. The cubic root of 72721799 is about 417.4023322043.

The spelling of 72721799 in words is "seventy-two million, seven hundred twenty-one thousand, seven hundred ninety-nine".