721403673 has 8 divisors (see below), whose sum is σ = 976228128. Its totient is φ = 473757504.

The previous prime is 721403663. The next prime is 721403677. The reversal of 721403673 is 376304127.

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

It is not a de Polignac number, because 721403673 - 2¹³ = 721395481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721403677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1794336 + ... + 1794737.

It is an arithmetic number, because the mean of its divisors is an integer number (122028516).

Almost surely, 2^721403673 is an apocalyptic number.

It is an amenable number.

721403673 is a deficient number, since it is larger than the sum of its proper divisors (254824455).

721403673 is a wasteful number, since it uses less digits than its factorization.

721403673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3589143.

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

The square root of 721403673 is about 26858.9588964278. The cubic root of 721403673 is about 896.8630181486.

The spelling of 721403673 in words is "seven hundred twenty-one million, four hundred three thousand, six hundred seventy-three".