77834819 has 2 divisors, whose sum is σ = 77834820. Its totient is φ = 77834818.

The previous prime is 77834803. The next prime is 77834821. The reversal of 77834819 is 91843877.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77834819 - 2⁴ = 77834803 is a prime.

It is a super-2 number, since 2×77834819² = 12116518097525522, which contains 22 as substring.

Together with 77834821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77834839) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38917409 + 38917410.

It is an arithmetic number, because the mean of its divisors is an integer number (38917410).

Almost surely, 2^77834819 is an apocalyptic number.

77834819 is a deficient number, since it is larger than the sum of its proper divisors (1).

77834819 is an equidigital number, since it uses as much as digits as its factorization.

77834819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 77834819 is about 8822.4043774926. The cubic root of 77834819 is about 426.9640473068.

The spelling of 77834819 in words is "seventy-seven million, eight hundred thirty-four thousand, eight hundred nineteen".