721434663 has 12 divisors (see below), whose sum is σ = 1048975408. Its totient is φ = 477770400.

The previous prime is 721434643. The next prime is 721434667. The reversal of 721434663 is 366434127.

It is a happy number.

It is not a de Polignac number, because 721434663 - 2¹⁰ = 721433639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721434667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 264070 + ... + 266787.

Almost surely, 2^721434663 is an apocalyptic number.

721434663 is a deficient number, since it is larger than the sum of its proper divisors (327540745).

721434663 is a wasteful number, since it uses less digits than its factorization.

721434663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531014 (or 531011 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 721434663 is about 26859.5357927124. The cubic root of 721434663 is about 896.8758604208.

The spelling of 721434663 in words is "seven hundred twenty-one million, four hundred thirty-four thousand, six hundred sixty-three".