77989927008 has 96 divisors (see below), whose sum is σ = 234213686784. Its totient is φ = 22259607552.

The previous prime is 77989926997. The next prime is 77989927009. The reversal of 77989927008 is 80072998977.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 77989927008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77989927009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 589816 + ... + 709832.

It is an arithmetic number, because the mean of its divisors is an integer number (2439725904).

Almost surely, 2^77989927008 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 77989927008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117106843392).

77989927008 is an abundant number, since it is smaller than the sum of its proper divisors (156223759776).

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

77989927008 is a wasteful number, since it uses less digits than its factorization.

77989927008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121004 (or 120996 counting only the distinct ones).

The product of its (nonzero) digits is 32006016, while the sum is 66.

The spelling of 77989927008 in words is "seventy-seven billion, nine hundred eighty-nine million, nine hundred twenty-seven thousand, eight".