77643227 has 2 divisors, whose sum is σ = 77643228. Its totient is φ = 77643226.

The previous prime is 77643221. The next prime is 77643271. The reversal of 77643227 is 72234677.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77643227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77643221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38821613 + 38821614.

It is an arithmetic number, because the mean of its divisors is an integer number (38821614).

Almost surely, 2^77643227 is an apocalyptic number.

77643227 is a deficient number, since it is larger than the sum of its proper divisors (1).

77643227 is an equidigital number, since it uses as much as digits as its factorization.

77643227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98784, while the sum is 38.

The square root of 77643227 is about 8811.5394228250. The cubic root of 77643227 is about 426.6134325538.

The spelling of 77643227 in words is "seventy-seven million, six hundred forty-three thousand, two hundred twenty-seven".