77973736578 has 16 divisors (see below), whose sum is σ = 156731131200. Its totient is φ = 25860635856.

The previous prime is 77973736559. The next prime is 77973736583. The reversal of 77973736578 is 87563737977.

It is a happy 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, 32651125 + ... + 32653512.

It is an arithmetic number, because the mean of its divisors is an integer number (9795695700).

Almost surely, 2^77973736578 is an apocalyptic number.

77973736578 is an abundant number, since it is smaller than the sum of its proper divisors (78757394622).

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

77973736578 is a wasteful number, since it uses less digits than its factorization.

77973736578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65304841.

The product of its digits is 326728080, while the sum is 69.

The spelling of 77973736578 in words is "seventy-seven billion, nine hundred seventy-three million, seven hundred thirty-six thousand, five hundred seventy-eight".