72779071 has 2 divisors, whose sum is σ = 72779072. Its totient is φ = 72779070.

The previous prime is 72779051. The next prime is 72779081. The reversal of 72779071 is 17097727.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72779071 - 2⁷ = 72778943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72779051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36389535 + 36389536.

It is an arithmetic number, because the mean of its divisors is an integer number (36389536).

Almost surely, 2^72779071 is an apocalyptic number.

72779071 is a deficient number, since it is larger than the sum of its proper divisors (1).

72779071 is an equidigital number, since it uses as much as digits as its factorization.

72779071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43218, while the sum is 40.

The square root of 72779071 is about 8531.0650566034. The cubic root of 72779071 is about 417.5118784195.

The spelling of 72779071 in words is "seventy-two million, seven hundred seventy-nine thousand, seventy-one".