77863238478 has 24 divisors (see below), whose sum is σ = 169635755016. Its totient is φ = 25811017200.

The previous prime is 77863238473. The next prime is 77863238489. The reversal of 77863238478 is 87483236877.

77863238478 is a `hidden beast` number, since 7 + 78 + 63 + 2 + 38 + 478 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77863238473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11946288 + ... + 11952803.

It is an arithmetic number, because the mean of its divisors is an integer number (7068156459).

Almost surely, 2^77863238478 is an apocalyptic number.

77863238478 is an abundant number, since it is smaller than the sum of its proper divisors (91772516538).

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

77863238478 is a wasteful number, since it uses less digits than its factorization.

77863238478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23899280 (or 23899277 counting only the distinct ones).

The product of its digits is 75866112, while the sum is 63.

The spelling of 77863238478 in words is "seventy-seven billion, eight hundred sixty-three million, two hundred thirty-eight thousand, four hundred seventy-eight".