721440773000 has 128 divisors (see below), whose sum is σ = 1834347340800. Its totient is φ = 264568896000.

The previous prime is 721440772999. The next prime is 721440773003. The reversal of 721440773000 is 377044127.

It is a happy number.

721440773000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (721440773003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23429 + ... + 1201428.

It is an arithmetic number, because the mean of its divisors is an integer number (14330838600).

Almost surely, 2^721440773000 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 721440773000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (917173670400).

721440773000 is an abundant number, since it is smaller than the sum of its proper divisors (1112906567800).

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

721440773000 is a wasteful number, since it uses less digits than its factorization.

721440773000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224928 (or 1224914 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 35.

The spelling of 721440773000 in words is "seven hundred twenty-one billion, four hundred forty million, seven hundred seventy-three thousand".