77812223 has 2 divisors, whose sum is σ = 77812224. Its totient is φ = 77812222.

The previous prime is 77812211. The next prime is 77812253. The reversal of 77812223 is 32221877.

It is a weak prime.

It is an emirp because it is prime and its reverse (32221877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77812223 - 2⁶ = 77812159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77812223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77812253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38906111 + 38906112.

It is an arithmetic number, because the mean of its divisors is an integer number (38906112).

Almost surely, 2^77812223 is an apocalyptic number.

77812223 is a deficient number, since it is larger than the sum of its proper divisors (1).

77812223 is an equidigital number, since it uses as much as digits as its factorization.

77812223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 32.

The square root of 77812223 is about 8821.1236812551. The cubic root of 77812223 is about 426.9227264109.

The spelling of 77812223 in words is "seventy-seven million, eight hundred twelve thousand, two hundred twenty-three".