721675505 has 8 divisors (see below), whose sum is σ = 893946624. Its totient is φ = 558716400.

The previous prime is 721675489. The next prime is 721675511. The reversal of 721675505 is 505576127.

721675505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 721675505 - 2⁴ = 721675489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2327831 + ... + 2328140.

It is an arithmetic number, because the mean of its divisors is an integer number (111743328).

Almost surely, 2^721675505 is an apocalyptic number.

It is an amenable number.

721675505 is a deficient number, since it is larger than the sum of its proper divisors (172271119).

721675505 is a wasteful number, since it uses less digits than its factorization.

721675505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4656007.

The product of its (nonzero) digits is 73500, while the sum is 38.

The square root of 721675505 is about 26864.0187797731. The cubic root of 721675505 is about 896.9756529382.

The spelling of 721675505 in words is "seven hundred twenty-one million, six hundred seventy-five thousand, five hundred five".