77443648 has 56 divisors (see below), whose sum is σ = 158739840. Its totient is φ = 37470720.

The previous prime is 77443643. The next prime is 77443651. The reversal of 77443648 is 84634477.

It is not an unprimeable number, because it can be changed into a prime (77443643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323913 + ... + 324151.

It is an arithmetic number, because the mean of its divisors is an integer number (2834640).

Almost surely, 2^77443648 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 77443648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79369920).

77443648 is an abundant number, since it is smaller than the sum of its proper divisors (81296192).

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

77443648 is a wasteful number, since it uses less digits than its factorization.

77443648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395 (or 385 counting only the distinct ones).

The product of its digits is 451584, while the sum is 43.

The square root of 77443648 is about 8800.2072702863. The cubic root of 77443648 is about 426.2475876404.

The spelling of 77443648 in words is "seventy-seven million, four hundred forty-three thousand, six hundred forty-eight".