77805989472 has 24 divisors (see below), whose sum is σ = 204240722616. Its totient is φ = 25935329792.

The previous prime is 77805989449. The next prime is 77805989509. The reversal of 77805989472 is 27498950877.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405239433 + ... + 405239624.

It is an arithmetic number, because the mean of its divisors is an integer number (8510030109).

Almost surely, 2^77805989472 is an apocalyptic number.

It is an amenable number.

77805989472 is an abundant number, since it is smaller than the sum of its proper divisors (126434733144).

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

77805989472 is a wasteful number, since it uses less digits than its factorization.

77805989472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810479070 (or 810479062 counting only the distinct ones).

The product of its (nonzero) digits is 71124480, while the sum is 66.

The spelling of 77805989472 in words is "seventy-seven billion, eight hundred five million, nine hundred eighty-nine thousand, four hundred seventy-two".