721310444536 has 64 divisors (see below), whose sum is σ = 1524239861760. Its totient is φ = 317034000000.

The previous prime is 721310444531. The next prime is 721310444539. The reversal of 721310444536 is 635444013127.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721310444531) 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, 3267661 + ... + 3481411.

It is an arithmetic number, because the mean of its divisors is an integer number (23816247840).

Almost surely, 2^721310444536 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 721310444536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (762119930880).

721310444536 is an abundant number, since it is smaller than the sum of its proper divisors (802929417224).

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

721310444536 is a wasteful number, since it uses less digits than its factorization.

721310444536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215036 (or 215032 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 721310444536 in words is "seven hundred twenty-one billion, three hundred ten million, four hundred forty-four thousand, five hundred thirty-six".