77443440432 has 80 divisors (see below), whose sum is σ = 212034866400. Its totient is φ = 24272551936.

The previous prime is 77443440413. The next prime is 77443440433. The reversal of 77443440432 is 23404434477.

It is not an unprimeable number, because it can be changed into a prime (77443440433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 810748 + ... + 901220.

It is an arithmetic number, because the mean of its divisors is an integer number (2650435830).

Almost surely, 2^77443440432 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 77443440432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106017433200).

77443440432 is an abundant number, since it is smaller than the sum of its proper divisors (134591425968).

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

77443440432 is a wasteful number, since it uses less digits than its factorization.

77443440432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91550 (or 91544 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 42.

The spelling of 77443440432 in words is "seventy-seven billion, four hundred forty-three million, four hundred forty thousand, four hundred thirty-two".