77901885312 has 64 divisors (see below), whose sum is σ = 207240609360. Its totient is φ = 25927925760.

The previous prime is 77901885289. The next prime is 77901885319. The reversal of 77901885312 is 21358810977.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77901885319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100368 + ... + 407280.

Almost surely, 2^77901885312 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 77901885312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103620304680).

77901885312 is an abundant number, since it is smaller than the sum of its proper divisors (129338724048).

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

77901885312 is a wasteful number, since it uses less digits than its factorization.

77901885312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307591 (or 307579 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 51.

The spelling of 77901885312 in words is "seventy-seven billion, nine hundred one million, eight hundred eighty-five thousand, three hundred twelve".