77834433278 has 32 divisors (see below), whose sum is σ = 136234617600. Its totient is φ = 33337747800.

The previous prime is 77834433277. The next prime is 77834433311. The reversal of 77834433278 is 87233443877.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77834433277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1149053 + ... + 1214903.

It is an arithmetic number, because the mean of its divisors is an integer number (4257331800).

Almost surely, 2^77834433278 is an apocalyptic number.

77834433278 is a deficient number, since it is larger than the sum of its proper divisors (58400184322).

77834433278 is a wasteful number, since it uses less digits than its factorization.

77834433278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67597 (or 67583 counting only the distinct ones).

The product of its digits is 18966528, while the sum is 56.

The spelling of 77834433278 in words is "seventy-seven billion, eight hundred thirty-four million, four hundred thirty-three thousand, two hundred seventy-eight".