77757208812 has 36 divisors (see below), whose sum is σ = 199245457320. Its totient is φ = 25564012992.

The previous prime is 77757208811. The next prime is 77757208813. The reversal of 77757208812 is 21880275777.

It is an interprime number because it is at equal distance from previous prime (77757208811) and next prime (77757208813).

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (77757208811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14791362 + ... + 14796617.

Almost surely, 2^77757208812 is an apocalyptic number.

It is an amenable number.

77757208812 is an abundant number, since it is smaller than the sum of its proper divisors (121488248508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77757208812 is a wasteful number, since it uses less digits than its factorization.

77757208812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29588062 (or 29588057 counting only the distinct ones).

The product of its (nonzero) digits is 3073280, while the sum is 54.

The spelling of 77757208812 in words is "seventy-seven billion, seven hundred fifty-seven million, two hundred eight thousand, eight hundred twelve".