77901872868 has 72 divisors (see below), whose sum is σ = 207413125920. Its totient is φ = 24585120000.

The previous prime is 77901872813. The next prime is 77901872897. The reversal of 77901872868 is 86827810977.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1077868 + ... + 1147868.

It is an arithmetic number, because the mean of its divisors is an integer number (2880737860).

Almost surely, 2^77901872868 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 77901872868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103706562960).

77901872868 is an abundant number, since it is smaller than the sum of its proper divisors (129511253052).

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

77901872868 is a wasteful number, since it uses less digits than its factorization.

77901872868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71657 (or 71652 counting only the distinct ones).

The product of its (nonzero) digits is 18966528, while the sum is 63.

The spelling of 77901872868 in words is "seventy-seven billion, nine hundred one million, eight hundred seventy-two thousand, eight hundred sixty-eight".