77858072512 has 56 divisors (see below), whose sum is σ = 169141030272. Its totient is φ = 35264889600.

The previous prime is 77858072449. The next prime is 77858072531. The reversal of 77858072512 is 21527085877.

It is a self number, because there is not a number n which added to its sum of digits gives 77858072512.

It is a congruent 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, 3837 + ... + 394627.

Almost surely, 2^77858072512 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 77858072512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84570515136).

77858072512 is an abundant number, since it is smaller than the sum of its proper divisors (91282957760).

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

77858072512 is a wasteful number, since it uses less digits than its factorization.

77858072512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391097 (or 391087 counting only the distinct ones).

The product of its (nonzero) digits is 2195200, while the sum is 52.

The spelling of 77858072512 in words is "seventy-seven billion, eight hundred fifty-eight million, seventy-two thousand, five hundred twelve".