77983640176 has 80 divisors (see below), whose sum is σ = 170472644608. Its totient is φ = 34311340800.

The previous prime is 77983640143. The next prime is 77983640233. The reversal of 77983640176 is 67104638977.

It is a self number, because there is not a number n which added to its sum of digits gives 77983640176.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341761 + ... + 522271.

Almost surely, 2^77983640176 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77983640176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85236322304).

77983640176 is an abundant number, since it is smaller than the sum of its proper divisors (92489004432).

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

77983640176 is a wasteful number, since it uses less digits than its factorization.

77983640176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180630 (or 180624 counting only the distinct ones).

The product of its (nonzero) digits is 10668672, while the sum is 58.

The spelling of 77983640176 in words is "seventy-seven billion, nine hundred eighty-three million, six hundred forty thousand, one hundred seventy-six".