77919073 has 2 divisors, whose sum is σ = 77919074. Its totient is φ = 77919072.

The previous prime is 77919067. The next prime is 77919119. The reversal of 77919073 is 37091977.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41835024 + 36084049 = 6468^2 + 6007^2 .

It is a cyclic number.

It is not a de Polignac number, because 77919073 - 2²⁵ = 44364641 is a prime.

It is not a weakly prime, because it can be changed into another prime (77919013) 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, 38959536 + 38959537.

It is an arithmetic number, because the mean of its divisors is an integer number (38959537).

Almost surely, 2^77919073 is an apocalyptic number.

It is an amenable number.

77919073 is a deficient number, since it is larger than the sum of its proper divisors (1).

77919073 is an equidigital number, since it uses as much as digits as its factorization.

77919073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 83349, while the sum is 43.

The square root of 77919073 is about 8827.1780881548. The cubic root of 77919073 is about 427.1180506052.

The spelling of 77919073 in words is "seventy-seven million, nine hundred nineteen thousand, seventy-three".