72806779 has 2 divisors, whose sum is σ = 72806780. Its totient is φ = 72806778.

The previous prime is 72806777. The next prime is 72806813. The reversal of 72806779 is 97760827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72806779 - 2¹ = 72806777 is a prime.

Together with 72806777, 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 (72806777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36403389 + 36403390.

It is an arithmetic number, because the mean of its divisors is an integer number (36403390).

Almost surely, 2^72806779 is an apocalyptic number.

72806779 is a deficient number, since it is larger than the sum of its proper divisors (1).

72806779 is an equidigital number, since it uses as much as digits as its factorization.

72806779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 72806779 is about 8532.6888493604. The cubic root of 72806779 is about 417.5648558813.

The spelling of 72806779 in words is "seventy-two million, eight hundred six thousand, seven hundred seventy-nine".