77719879 has 2 divisors, whose sum is σ = 77719880. Its totient is φ = 77719878.

The previous prime is 77719853. The next prime is 77719897. The reversal of 77719879 is 97891777.

Together with next prime (77719897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77719879 - 2⁵ = 77719847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77719079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38859939 + 38859940.

It is an arithmetic number, because the mean of its divisors is an integer number (38859940).

Almost surely, 2^77719879 is an apocalyptic number.

77719879 is a deficient number, since it is larger than the sum of its proper divisors (1).

77719879 is an equidigital number, since it uses as much as digits as its factorization.

77719879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1555848, while the sum is 55.

The square root of 77719879 is about 8815.8878736064. The cubic root of 77719879 is about 426.7537754139.

The spelling of 77719879 in words is "seventy-seven million, seven hundred nineteen thousand, eight hundred seventy-nine".