721630233 has 12 divisors (see below), whose sum is σ = 1043650608. Its totient is φ = 480488760.

The previous prime is 721630223. The next prime is 721630237. The reversal of 721630233 is 332036127.

721630233 is a `hidden beast` number, since 7 + 2 + 1 + 630 + 23 + 3 = 666.

It is not a de Polignac number, because 721630233 - 2⁵ = 721630201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 721630197 and 721630206.

It is not an unprimeable number, because it can be changed into a prime (721630237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42135 + ... + 56732.

It is an arithmetic number, because the mean of its divisors is an integer number (86970884).

Almost surely, 2^721630233 is an apocalyptic number.

It is an amenable number.

721630233 is a deficient number, since it is larger than the sum of its proper divisors (322020375).

721630233 is a wasteful number, since it uses less digits than its factorization.

721630233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99684 (or 99681 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 27.

The square root of 721630233 is about 26863.1761524954. The cubic root of 721630233 is about 896.9568962483.

The spelling of 721630233 in words is "seven hundred twenty-one million, six hundred thirty thousand, two hundred thirty-three".