72776987736 has 72 divisors (see below), whose sum is σ = 185618768580. Its totient is φ = 23778371136.

The previous prime is 72776987719. The next prime is 72776987797. The reversal of 72776987736 is 63778967727.

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 17 ways as a sum of consecutive naturals, for example, 70044705 + ... + 70045743.

Almost surely, 2^72776987736 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 72776987736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92809384290).

72776987736 is an abundant number, since it is smaller than the sum of its proper divisors (112841780844).

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

72776987736 is an equidigital number, since it uses as much as digits as its factorization.

72776987736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193 (or 1097 counting only the distinct ones).

The product of its digits is 261382464, while the sum is 69.

The spelling of 72776987736 in words is "seventy-two billion, seven hundred seventy-six million, nine hundred eighty-seven thousand, seven hundred thirty-six".