721630232 has 16 divisors (see below), whose sum is σ = 1357076760. Its totient is φ = 359743104.

The previous prime is 721630223. The next prime is 721630237. The reversal of 721630232 is 232036127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721630237) 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 3 ways as a sum of consecutive naturals, for example, 131138 + ... + 136529.

Almost surely, 2^721630232 is an apocalyptic number.

It is an amenable number.

721630232 is a deficient number, since it is larger than the sum of its proper divisors (635446528).

721630232 is a wasteful number, since it uses less digits than its factorization.

721630232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268010 (or 268006 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 721630232 is about 26863.1761338826. The cubic root of 721630232 is about 896.9568958340.

Adding to 721630232 its reverse (232036127), we get a palindrome (953666359).

The spelling of 721630232 in words is "seven hundred twenty-one million, six hundred thirty thousand, two hundred thirty-two".