77934889 has 2 divisors, whose sum is σ = 77934890. Its totient is φ = 77934888.

The previous prime is 77934887. The next prime is 77934893. The reversal of 77934889 is 98843977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77580864 + 354025 = 8808^2 + 595^2 .

It is a cyclic number.

It is not a de Polignac number, because 77934889 - 2¹ = 77934887 is a prime.

Together with 77934887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77934887) 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, 38967444 + 38967445.

It is an arithmetic number, because the mean of its divisors is an integer number (38967445).

Almost surely, 2^77934889 is an apocalyptic number.

It is an amenable number.

77934889 is a deficient number, since it is larger than the sum of its proper divisors (1).

77934889 is an equidigital number, since it uses as much as digits as its factorization.

77934889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 55.

The square root of 77934889 is about 8828.0739122416. The cubic root of 77934889 is about 427.1469474329.

The spelling of 77934889 in words is "seventy-seven million, nine hundred thirty-four thousand, eight hundred eighty-nine".