77998223 has 2 divisors, whose sum is σ = 77998224. Its totient is φ = 77998222.

The previous prime is 77998213. The next prime is 77998229. The reversal of 77998223 is 32289977.

It is a strong prime.

It is an emirp because it is prime and its reverse (32289977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77998223 - 2⁸ = 77997967 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77998229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38999111 + 38999112.

It is an arithmetic number, because the mean of its divisors is an integer number (38999112).

Almost surely, 2^77998223 is an apocalyptic number.

77998223 is a deficient number, since it is larger than the sum of its proper divisors (1).

77998223 is an equidigital number, since it uses as much as digits as its factorization.

77998223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 77998223 is about 8831.6602629404. The cubic root of 77998223 is about 427.2626234808.

The spelling of 77998223 in words is "seventy-seven million, nine hundred ninety-eight thousand, two hundred twenty-three".