72222823 has 2 divisors, whose sum is σ = 72222824. Its totient is φ = 72222822.

The previous prime is 72222811. The next prime is 72222863. The reversal of 72222823 is 32822227.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72222823 - 2¹⁷ = 72091751 is a prime.

It is a super-2 number, since 2×72222823² = 10432272324178658, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72222791 and 72222800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72222863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36111411 + 36111412.

It is an arithmetic number, because the mean of its divisors is an integer number (36111412).

Almost surely, 2^72222823 is an apocalyptic number.

72222823 is a deficient number, since it is larger than the sum of its proper divisors (1).

72222823 is an equidigital number, since it uses as much as digits as its factorization.

72222823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 28.

The square root of 72222823 is about 8498.4012025792. The cubic root of 72222823 is about 416.4454805426.

The spelling of 72222823 in words is "seventy-two million, two hundred twenty-two thousand, eight hundred twenty-three".