77766328838420 has 48 divisors (see below), whose sum is σ = 165362457028608. Its totient is φ = 30717483793920.

The previous prime is 77766328838371. The next prime is 77766328838431. The reversal of 77766328838420 is 2483882366777.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62874404 + ... + 64099323.

It is an arithmetic number, because the mean of its divisors is an integer number (3445051188096).

Almost surely, 2^{77766328838420} is an apocalyptic number.

It is an amenable number.

77766328838420 is an abundant number, since it is smaller than the sum of its proper divisors (87596128190188).

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

77766328838420 is a wasteful number, since it uses less digits than its factorization.

77766328838420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126974120 (or 126974118 counting only the distinct ones).

The product of its (nonzero) digits is 910393344, while the sum is 71.

The spelling of 77766328838420 in words is "seventy-seven trillion, seven hundred sixty-six billion, three hundred twenty-eight million, eight hundred thirty-eight thousand, four hundred twenty".