721986477696 has 192 divisors, whose sum is σ = 2304880250400. Its totient is φ = 215075358720.

The previous prime is 721986477689. The next prime is 721986477697. The reversal of 721986477696 is 696774689127.

721986477696 is a `hidden beast` number, since 7 + 2 + 1 + 98 + 6 + 477 + 69 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (721986477697) 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 23 ways as a sum of consecutive naturals, for example, 264810 + ... + 1230486.

Almost surely, 2^721986477696 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 721986477696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1152440125200).

721986477696 is an abundant number, since it is smaller than the sum of its proper divisors (1582893772704).

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

721986477696 is a wasteful number, since it uses less digits than its factorization.

721986477696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965767 (or 965752 counting only the distinct ones).

The product of its digits is 384072192, while the sum is 72.

The spelling of 721986477696 in words is "seven hundred twenty-one billion, nine hundred eighty-six million, four hundred seventy-seven thousand, six hundred ninety-six".