721006265472 has 128 divisors (see below), whose sum is σ = 1931116844160. Its totient is φ = 238338220032.

The previous prime is 721006265449. The next prime is 721006265479. The reversal of 721006265472 is 274562600127.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (721006265479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55915858 + ... + 55928750.

It is an arithmetic number, because the mean of its divisors is an integer number (15086850345).

Almost surely, 2^721006265472 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 721006265472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (965558422080).

721006265472 is an abundant number, since it is smaller than the sum of its proper divisors (1210110578688).

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

721006265472 is a wasteful number, since it uses less digits than its factorization.

721006265472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14110 (or 14098 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 42.

Adding to 721006265472 its reverse (274562600127), we get a palindrome (995568865599).

The spelling of 721006265472 in words is "seven hundred twenty-one billion, six million, two hundred sixty-five thousand, four hundred seventy-two".