77743434438 has 24 divisors (see below), whose sum is σ = 168718918368. Its totient is φ = 25872199632.

The previous prime is 77743434437. The next prime is 77743434449. The reversal of 77743434438 is 83443434777.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77743434437) 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 11 ways as a sum of consecutive naturals, for example, 3511870 + ... + 3533937.

It is an arithmetic number, because the mean of its divisors is an integer number (7029954932).

Almost surely, 2^77743434438 is an apocalyptic number.

77743434438 is an abundant number, since it is smaller than the sum of its proper divisors (90975483930).

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

77743434438 is a wasteful number, since it uses less digits than its factorization.

77743434438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7046428 (or 7046425 counting only the distinct ones).

The product of its digits is 18966528, while the sum is 54.

The spelling of 77743434438 in words is "seventy-seven billion, seven hundred forty-three million, four hundred thirty-four thousand, four hundred thirty-eight".