721334632 has 32 divisors (see below), whose sum is σ = 1431698400. Its totient is φ = 340127424.

The previous prime is 721334597. The next prime is 721334651. The reversal of 721334632 is 236433127.

It is a junction number, because it is equal to n+sod(n) for n = 721334594 and 721334603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26178 + ... + 46129.

It is an arithmetic number, because the mean of its divisors is an integer number (44740575).

Almost surely, 2^721334632 is an apocalyptic number.

It is an amenable number.

721334632 is a deficient number, since it is larger than the sum of its proper divisors (710363768).

721334632 is a wasteful number, since it uses less digits than its factorization.

721334632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72385 (or 72381 counting only the distinct ones).

The product of its digits is 18144, while the sum is 31.

The square root of 721334632 is about 26857.6736148163. The cubic root of 721334632 is about 896.8344061997.

Adding to 721334632 its reverse (236433127), we get a palindrome (957767759).

The spelling of 721334632 in words is "seven hundred twenty-one million, three hundred thirty-four thousand, six hundred thirty-two".