77043394640 has 40 divisors (see below), whose sum is σ = 179499939840. Its totient is φ = 30753005696.

The previous prime is 77043394619. The next prime is 77043394651. The reversal of 77043394640 is 4649334077.

It is a tau number, because it is divible by the number of its divisors (40).

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, 966944 + ... + 1043583.

It is an arithmetic number, because the mean of its divisors is an integer number (4487498496).

Almost surely, 2^77043394640 is an apocalyptic number.

It is an amenable number.

77043394640 is an abundant number, since it is smaller than the sum of its proper divisors (102456545200).

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

77043394640 is a wasteful number, since it uses less digits than its factorization.

77043394640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011019 (or 2011013 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 47.

The spelling of 77043394640 in words is "seventy-seven billion, forty-three million, three hundred ninety-four thousand, six hundred forty".