721733460 has 96 divisors (see below), whose sum is σ = 2342172672. Its totient is φ = 162637440.

The previous prime is 721733443. The next prime is 721733461. The reversal of 721733460 is 64337127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721733461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17719 + ... + 41921.

It is an arithmetic number, because the mean of its divisors is an integer number (24397632).

Almost surely, 2^721733460 is an apocalyptic number.

721733460 is a gapful number since it is divisible by the number (70) 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 721733460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1171086336).

721733460 is an abundant number, since it is smaller than the sum of its proper divisors (1620439212).

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

721733460 is a wasteful number, since it uses less digits than its factorization.

721733460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24293 (or 24291 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 33.

The square root of 721733460 is about 26865.0974314258. The cubic root of 721733460 is about 896.9996631903. Note that the first 3 decimals are identical.

The spelling of 721733460 in words is "seven hundred twenty-one million, seven hundred thirty-three thousand, four hundred sixty".