72784219 has 2 divisors, whose sum is σ = 72784220. Its totient is φ = 72784218.

The previous prime is 72784207. The next prime is 72784223. The reversal of 72784219 is 91248727.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72784219 - 2¹³ = 72776027 is a prime.

It is a super-2 number, since 2×72784219² = 10595085070879922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72784319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36392109 + 36392110.

It is an arithmetic number, because the mean of its divisors is an integer number (36392110).

Almost surely, 2^72784219 is an apocalyptic number.

72784219 is a deficient number, since it is larger than the sum of its proper divisors (1).

72784219 is an equidigital number, since it uses as much as digits as its factorization.

72784219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 40.

The square root of 72784219 is about 8531.3667720946. The cubic root of 72784219 is about 417.5217223689.

The spelling of 72784219 in words is "seventy-two million, seven hundred eighty-four thousand, two hundred nineteen".