77956193408 has 32 divisors (see below), whose sum is σ = 155316649500. Its totient is φ = 38974759936.

The previous prime is 77956193407. The next prime is 77956193443. The reversal of 77956193408 is 80439165977.

It can be written as a sum of positive squares in 2 ways, for example, as 77021790784 + 934402624 = 277528^2 + 30568^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (77956193407) 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, 2244398 + ... + 2278866.

Almost surely, 2^77956193408 is an apocalyptic number.

It is an amenable number.

77956193408 is a deficient number, since it is larger than the sum of its proper divisors (77360456092).

77956193408 is a wasteful number, since it uses less digits than its factorization.

77956193408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52152 (or 52140 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 59.

The spelling of 77956193408 in words is "seventy-seven billion, nine hundred fifty-six million, one hundred ninety-three thousand, four hundred eight".