721641803 has 8 divisors (see below), whose sum is σ = 740612400. Its totient is φ = 702895968.

The previous prime is 721641797. The next prime is 721641827. The reversal of 721641803 is 308146127.

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

It is a cyclic number.

It is not a de Polignac number, because 721641803 - 2⁴ = 721641787 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 721641803.

It is not an unprimeable number, because it can be changed into a prime (721641863) 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 7 ways as a sum of consecutive naturals, for example, 49676 + ... + 62537.

It is an arithmetic number, because the mean of its divisors is an integer number (92576550).

Almost surely, 2^721641803 is an apocalyptic number.

721641803 is a deficient number, since it is larger than the sum of its proper divisors (18970597).

721641803 is a wasteful number, since it uses less digits than its factorization.

721641803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112381.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 721641803 is about 26863.3915021912. The cubic root of 721641803 is about 896.9616899018.

The spelling of 721641803 in words is "seven hundred twenty-one million, six hundred forty-one thousand, eight hundred three".