77731212548478 has 32 divisors (see below), whose sum is σ = 156309377479200. Its totient is φ = 25769489043456.

The previous prime is 77731212548453. The next prime is 77731212548491. The reversal of 77731212548478 is 87484521213777.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29171851 + ... + 31724742.

It is an arithmetic number, because the mean of its divisors is an integer number (4884668046225).

Almost surely, 2^{77731212548478} is an apocalyptic number.

77731212548478 is an abundant number, since it is smaller than the sum of its proper divisors (78578164930722).

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

77731212548478 is a wasteful number, since it uses less digits than its factorization.

77731212548478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60897756.

The product of its digits is 147517440, while the sum is 66.

The spelling of 77731212548478 in words is "seventy-seven trillion, seven hundred thirty-one billion, two hundred twelve million, five hundred forty-eight thousand, four hundred seventy-eight".