721303536 has 120 divisors (see below), whose sum is σ = 2029215360. Its totient is φ = 220164480.

The previous prime is 721303511. The next prime is 721303547. The reversal of 721303536 is 635303127.

It is a super-2 number, since 2×721303536² = 1040557582092206592, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 876021 + ... + 876843.

It is an arithmetic number, because the mean of its divisors is an integer number (16910128).

Almost surely, 2^721303536 is an apocalyptic number.

721303536 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721303536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1014607680).

721303536 is an abundant number, since it is smaller than the sum of its proper divisors (1307911824).

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

721303536 is a wasteful number, since it uses less digits than its factorization.

721303536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915 (or 878 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 30.

The square root of 721303536 is about 26857.0947051240. The cubic root of 721303536 is about 896.8215188091.

The spelling of 721303536 in words is "seven hundred twenty-one million, three hundred three thousand, five hundred thirty-six".