77942719 has 2 divisors, whose sum is σ = 77942720. Its totient is φ = 77942718.

The previous prime is 77942713. The next prime is 77942723. The reversal of 77942719 is 91724977.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77942719 - 2⁵ = 77942687 is a prime.

It is a super-2 number, since 2×77942719² = 12150134890225922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77942713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38971359 + 38971360.

It is an arithmetic number, because the mean of its divisors is an integer number (38971360).

Almost surely, 2^77942719 is an apocalyptic number.

77942719 is a deficient number, since it is larger than the sum of its proper divisors (1).

77942719 is an equidigital number, since it uses as much as digits as its factorization.

77942719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 222264, while the sum is 46.

The square root of 77942719 is about 8828.5173726963. The cubic root of 77942719 is about 427.1612518890.

The spelling of 77942719 in words is "seventy-seven million, nine hundred forty-two thousand, seven hundred nineteen".