77615644764 has 96 divisors (see below), whose sum is σ = 209735680000. Its totient is φ = 21880497600.

The previous prime is 77615644723. The next prime is 77615644789. The reversal of 77615644764 is 46744651677.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 13262439 + ... + 13268289.

Almost surely, 2^77615644764 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 77615644764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104867840000).

77615644764 is an abundant number, since it is smaller than the sum of its proper divisors (132120035236).

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

77615644764 is a wasteful number, since it uses less digits than its factorization.

77615644764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7943 (or 7941 counting only the distinct ones).

The product of its digits is 23708160, while the sum is 57.

The spelling of 77615644764 in words is "seventy-seven billion, six hundred fifteen million, six hundred forty-four thousand, seven hundred sixty-four".