72784379 has 2 divisors, whose sum is σ = 72784380. Its totient is φ = 72784378.

The previous prime is 72784357. The next prime is 72784381. The reversal of 72784379 is 97348727.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72784379 - 2¹² = 72780283 is a prime.

Together with 72784381, it forms a pair of twin primes.

It is a Chen prime.

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, 36392189 + 36392190.

It is an arithmetic number, because the mean of its divisors is an integer number (36392190).

Almost surely, 2^72784379 is an apocalyptic number.

72784379 is a deficient number, since it is larger than the sum of its proper divisors (1).

72784379 is an equidigital number, since it uses as much as digits as its factorization.

72784379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 47.

The square root of 72784379 is about 8531.3761492505. The cubic root of 72784379 is about 417.5220283117.

The spelling of 72784379 in words is "seventy-two million, seven hundred eighty-four thousand, three hundred seventy-nine".