72221783 has 2 divisors, whose sum is σ = 72221784. Its totient is φ = 72221782.

The previous prime is 72221761. The next prime is 72221789. The reversal of 72221783 is 38712227.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72221783 - 2⁶ = 72221719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72221789) 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, 36110891 + 36110892.

It is an arithmetic number, because the mean of its divisors is an integer number (36110892).

Almost surely, 2^72221783 is an apocalyptic number.

72221783 is a deficient number, since it is larger than the sum of its proper divisors (1).

72221783 is an equidigital number, since it uses as much as digits as its factorization.

72221783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 32.

The square root of 72221783 is about 8498.3400143793. The cubic root of 72221783 is about 416.4434816114.

The spelling of 72221783 in words is "seventy-two million, two hundred twenty-one thousand, seven hundred eighty-three".