721089273984 has 128 divisors (see below), whose sum is σ = 1933204449600. Its totient is φ = 238136930304.

The previous prime is 721089273953. The next prime is 721089274027. The reversal of 721089273984 is 489372980127.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20902702 + ... + 20937170.

Almost surely, 2^721089273984 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 721089273984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (966602224800).

721089273984 is an abundant number, since it is smaller than the sum of its proper divisors (1212115175616).

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

721089273984 is a wasteful number, since it uses less digits than its factorization.

721089273984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34990 (or 34978 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 60.

The spelling of 721089273984 in words is "seven hundred twenty-one billion, eighty-nine million, two hundred seventy-three thousand, nine hundred eighty-four".