77873849 has 2 divisors, whose sum is σ = 77873850. Its totient is φ = 77873848.

The previous prime is 77873839. The next prime is 77873857. The reversal of 77873849 is 94837877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52823824 + 25050025 = 7268^2 + 5005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77873849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77873849.

It is not a weakly prime, because it can be changed into another prime (77873819) 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, 38936924 + 38936925.

It is an arithmetic number, because the mean of its divisors is an integer number (38936925).

Almost surely, 2^77873849 is an apocalyptic number.

It is an amenable number.

77873849 is a deficient number, since it is larger than the sum of its proper divisors (1).

77873849 is an equidigital number, since it uses as much as digits as its factorization.

77873849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 53.

The square root of 77873849 is about 8824.6160823007. The cubic root of 77873849 is about 427.0354019282.

The spelling of 77873849 in words is "seventy-seven million, eight hundred seventy-three thousand, eight hundred forty-nine".