77849685783444 has 24 divisors (see below), whose sum is σ = 184137612951040. Its totient is φ = 25594417243584.

The previous prime is 77849685783319. The next prime is 77849685783557. The reversal of 77849685783444 is 44438758694877.

It is a super-2 number, since 2×77849685783444² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44434751284 + ... + 44434753035.

Almost surely, 2^{77849685783444} is an apocalyptic number.

It is an amenable number.

77849685783444 is an abundant number, since it is smaller than the sum of its proper divisors (106287927167596).

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

77849685783444 is a wasteful number, since it uses less digits than its factorization.

77849685783444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88869504399 (or 88869504397 counting only the distinct ones).

The product of its digits is 36415733760, while the sum is 84.

The spelling of 77849685783444 in words is "seventy-seven trillion, eight hundred forty-nine billion, six hundred eighty-five million, seven hundred eighty-three thousand, four hundred forty-four".