77043961728 has 256 divisors, whose sum is σ = 237961267200. Its totient is φ = 24509952000.

The previous prime is 77043961703. The next prime is 77043961739. The reversal of 77043961728 is 82716934077.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 7816003 + ... + 7825853.

It is an arithmetic number, because the mean of its divisors is an integer number (929536200).

Almost surely, 2^77043961728 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 77043961728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118980633600).

77043961728 is an abundant number, since it is smaller than the sum of its proper divisors (160917305472).

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

77043961728 is a wasteful number, since it uses less digits than its factorization.

77043961728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9978 (or 9960 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 54.

The spelling of 77043961728 in words is "seventy-seven billion, forty-three million, nine hundred sixty-one thousand, seven hundred twenty-eight".