77398487544 has 128 divisors (see below), whose sum is σ = 223845672960. Its totient is φ = 21844021248.

The previous prime is 77398487539. The next prime is 77398487563. The reversal of 77398487544 is 44578489377.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9072609 + ... + 9081135.

It is an arithmetic number, because the mean of its divisors is an integer number (1748794320).

Almost surely, 2^77398487544 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 77398487544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111922836480).

77398487544 is an abundant number, since it is smaller than the sum of its proper divisors (146447185416).

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

77398487544 is a wasteful number, since it uses less digits than its factorization.

77398487544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9197 (or 9193 counting only the distinct ones).

The product of its digits is 189665280, while the sum is 66.

The spelling of 77398487544 in words is "seventy-seven billion, three hundred ninety-eight million, four hundred eighty-seven thousand, five hundred forty-four".