77789434372 has 12 divisors (see below), whose sum is σ = 146603164876. Its totient is φ = 35902815840.

The previous prime is 77789434339. The next prime is 77789434379. The reversal of 77789434372 is 27343498777.

It can be written as a sum of positive squares in 2 ways, for example, as 29396474116 + 48392960256 = 171454^2 + 219984^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77789434372.

It is not an unprimeable number, because it can be changed into a prime (77789434379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 747975279 + ... + 747975382.

Almost surely, 2^77789434372 is an apocalyptic number.

It is an amenable number.

77789434372 is a deficient number, since it is larger than the sum of its proper divisors (68813730504).

77789434372 is a wasteful number, since it uses less digits than its factorization.

77789434372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495950678 (or 1495950676 counting only the distinct ones).

The product of its digits is 49787136, while the sum is 61.

The spelling of 77789434372 in words is "seventy-seven billion, seven hundred eighty-nine million, four hundred thirty-four thousand, three hundred seventy-two".