630726993 has 20 divisors (see below), whose sum is σ = 1014675508. Its totient is φ = 388139040.

The previous prime is 630726973. The next prime is 630726997. The reversal of 630726993 is 399627036.

630726993 is a `hidden beast` number, since 630 + 7 + 2 + 6 + 9 + 9 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 282643344 + 348083649 = 16812^2 + 18657^2 .

It is not a de Polignac number, because 630726993 - 2⁸ = 630726737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630726997) 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 19 ways as a sum of consecutive naturals, for example, 298438 + ... + 300543.

Almost surely, 2^630726993 is an apocalyptic number.

It is an amenable number.

630726993 is a deficient number, since it is larger than the sum of its proper divisors (383948515).

630726993 is a wasteful number, since it uses less digits than its factorization.

630726993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599006 (or 598997 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 45.

The square root of 630726993 is about 25114.2786677221. The cubic root of 630726993 is about 857.5915093007.

The spelling of 630726993 in words is "six hundred thirty million, seven hundred twenty-six thousand, nine hundred ninety-three".