77849992784 has 10 divisors (see below), whose sum is σ = 150834361050. Its totient is φ = 38924996384.

The previous prime is 77849992769. The next prime is 77849992811. The reversal of 77849992784 is 48729994877.

It can be written as a sum of positive squares in only one way, i.e., 45636922384 + 32213070400 = 213628^2 + 179480^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2432812259 + ... + 2432812290.

It is an arithmetic number, because the mean of its divisors is an integer number (15083436105).

Almost surely, 2^77849992784 is an apocalyptic number.

It is an amenable number.

77849992784 is a deficient number, since it is larger than the sum of its proper divisors (72984368266).

77849992784 is a wasteful number, since it uses less digits than its factorization.

77849992784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4865624557 (or 4865624551 counting only the distinct ones).

The product of its digits is 512096256, while the sum is 74.

The spelling of 77849992784 in words is "seventy-seven billion, eight hundred forty-nine million, nine hundred ninety-two thousand, seven hundred eighty-four".