77990219 has 2 divisors, whose sum is σ = 77990220. Its totient is φ = 77990218.

The previous prime is 77990201. The next prime is 77990233. The reversal of 77990219 is 91209977.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77990219 - 2⁸ = 77989963 is a prime.

It is a super-2 number, since 2×77990219² = 12164948519335922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77990219.

It is not a weakly prime, because it can be changed into another prime (77990239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38995109 + 38995110.

It is an arithmetic number, because the mean of its divisors is an integer number (38995110).

Almost surely, 2^77990219 is an apocalyptic number.

77990219 is a deficient number, since it is larger than the sum of its proper divisors (1).

77990219 is an equidigital number, since it uses as much as digits as its factorization.

77990219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71442, while the sum is 44.

The square root of 77990219 is about 8831.2071088838. The cubic root of 77990219 is about 427.2480080751.

The spelling of 77990219 in words is "seventy-seven million, nine hundred ninety thousand, two hundred nineteen".