721865088 has 256 divisors, whose sum is σ = 2485209600. Its totient is φ = 201996288.

The previous prime is 721865087. The next prime is 721865093. The reversal of 721865088 is 880568127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721865087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1281895 + ... + 1282457.

It is an arithmetic number, because the mean of its divisors is an integer number (9707850).

Almost surely, 2^721865088 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 721865088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1242604800).

721865088 is an abundant number, since it is smaller than the sum of its proper divisors (1763344512).

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

721865088 is a wasteful number, since it uses less digits than its factorization.

721865088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 628 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The square root of 721865088 is about 26867.5471154328. The cubic root of 721865088 is about 897.0541907508.

The spelling of 721865088 in words is "seven hundred twenty-one million, eight hundred sixty-five thousand, eighty-eight".