77731744112 has 160 divisors (see below), whose sum is σ = 179937054720. Its totient is φ = 32130109440.

The previous prime is 77731744109. The next prime is 77731744121. The reversal of 77731744112 is 21144713777.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11105798 + ... + 11112794.

It is an arithmetic number, because the mean of its divisors is an integer number (1124606592).

Almost surely, 2^77731744112 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 77731744112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89968527360).

77731744112 is an abundant number, since it is smaller than the sum of its proper divisors (102205310608).

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

77731744112 is a wasteful number, since it uses less digits than its factorization.

77731744112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7159 (or 7153 counting only the distinct ones).

The product of its digits is 230496, while the sum is 44.

The spelling of 77731744112 in words is "seventy-seven billion, seven hundred thirty-one million, seven hundred forty-four thousand, one hundred twelve".