72905771 has 2 divisors, whose sum is σ = 72905772. Its totient is φ = 72905770.

The previous prime is 72905759. The next prime is 72905773. The reversal of 72905771 is 17750927.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72905771 is a prime.

Together with 72905773, 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 (72905773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36452885 + 36452886.

It is an arithmetic number, because the mean of its divisors is an integer number (36452886).

Almost surely, 2^72905771 is an apocalyptic number.

72905771 is a deficient number, since it is larger than the sum of its proper divisors (1).

72905771 is an equidigital number, since it uses as much as digits as its factorization.

72905771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30870, while the sum is 38.

The square root of 72905771 is about 8538.4876295513. The cubic root of 72905771 is about 417.7540180302.

The spelling of 72905771 in words is "seventy-two million, nine hundred five thousand, seven hundred seventy-one".