77845393878444 has 36 divisors (see below), whose sum is σ = 198724132566960. Its totient is φ = 25691549133600.

The previous prime is 77845393878433. The next prime is 77845393878479. The reversal of 77845393878444 is 44487839354877.

77845393878444 is a `hidden beast` number, since 7 + 7 + 8 + 4 + 5 + 3 + 93 + 87 + 8 + 444 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×77845393878444² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10704808504 + ... + 10704815775.

Almost surely, 2^{77845393878444} is an apocalyptic number.

It is an amenable number.

77845393878444 is an abundant number, since it is smaller than the sum of its proper divisors (120878738688516).

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

77845393878444 is a wasteful number, since it uses less digits than its factorization.

77845393878444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21409624390 (or 21409624385 counting only the distinct ones).

The product of its digits is 18207866880, while the sum is 81.

The spelling of 77845393878444 in words is "seventy-seven trillion, eight hundred forty-five billion, three hundred ninety-three million, eight hundred seventy-eight thousand, four hundred forty-four".