77681443 has 32 divisors (see below), whose sum is σ = 98058240. Its totient is φ = 60043680.

The previous prime is 77681437. The next prime is 77681447. The reversal of 77681443 is 34418677.

It is a cyclic number.

It is not a de Polignac number, because 77681443 - 2²¹ = 75584291 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77681396 and 77681405.

It is not an unprimeable number, because it can be changed into a prime (77681447) 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 31 ways as a sum of consecutive naturals, for example, 342096 + ... + 342322.

It is an arithmetic number, because the mean of its divisors is an integer number (3064320).

Almost surely, 2^77681443 is an apocalyptic number.

77681443 is a deficient number, since it is larger than the sum of its proper divisors (20376797).

77681443 is a wasteful number, since it uses less digits than its factorization.

77681443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367.

The product of its digits is 112896, while the sum is 40.

The square root of 77681443 is about 8813.7076761145. The cubic root of 77681443 is about 426.6834141240.

The spelling of 77681443 in words is "seventy-seven million, six hundred eighty-one thousand, four hundred forty-three".