721735460 has 12 divisors (see below), whose sum is σ = 1515644508. Its totient is φ = 288694176.

The previous prime is 721735447. The next prime is 721735481. The reversal of 721735460 is 64537127.

It can be written as a sum of positive squares in 2 ways, for example, as 186923584 + 534811876 = 13672^2 + 23126^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 721735460.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 18043367 + ... + 18043406.

It is an arithmetic number, because the mean of its divisors is an integer number (126303709).

Almost surely, 2^721735460 is an apocalyptic number.

It is an amenable number.

721735460 is an abundant number, since it is smaller than the sum of its proper divisors (793909048).

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

721735460 is a wasteful number, since it uses less digits than its factorization.

721735460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36086782 (or 36086780 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 721735460 is about 26865.1346544178. The cubic root of 721735460 is about 897.0004917500. Note that the first 3 decimals are identical.

The spelling of 721735460 in words is "seven hundred twenty-one million, seven hundred thirty-five thousand, four hundred sixty".