77065778 has 16 divisors (see below), whose sum is σ = 120890880. Its totient is φ = 36845908.

The previous prime is 77065771. The next prime is 77065829. The reversal of 77065778 is 87756077.

It is not an unprimeable number, because it can be changed into a prime (77065771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22751 + ... + 25917.

It is an arithmetic number, because the mean of its divisors is an integer number (7555680).

Almost surely, 2^77065778 is an apocalyptic number.

77065778 is a deficient number, since it is larger than the sum of its proper divisors (43825102).

77065778 is an equidigital number, since it uses as much as digits as its factorization.

77065778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3238 (or 3192 counting only the distinct ones).

The product of its (nonzero) digits is 576240, while the sum is 47.

The square root of 77065778 is about 8778.7116366811. The cubic root of 77065778 is about 425.5531951999.

The spelling of 77065778 in words is "seventy-seven million, sixty-five thousand, seven hundred seventy-eight".