77320387 has 2 divisors, whose sum is σ = 77320388. Its totient is φ = 77320386.

The previous prime is 77320379. The next prime is 77320391. The reversal of 77320387 is 78302377.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77320387 - 2³ = 77320379 is a prime.

It is not a weakly prime, because it can be changed into another prime (77320307) 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, 38660193 + 38660194.

It is an arithmetic number, because the mean of its divisors is an integer number (38660194).

Almost surely, 2^77320387 is an apocalyptic number.

77320387 is a deficient number, since it is larger than the sum of its proper divisors (1).

77320387 is an equidigital number, since it uses as much as digits as its factorization.

77320387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392, while the sum is 37.

The square root of 77320387 is about 8793.2011804575. The cubic root of 77320387 is about 426.0213259031.

The spelling of 77320387 in words is "seventy-seven million, three hundred twenty thousand, three hundred eighty-seven".