630256306 has 4 divisors (see below), whose sum is σ = 945384462. Its totient is φ = 315128152.

The previous prime is 630256303. The next prime is 630256313. The reversal of 630256306 is 603652036.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 517153081 + 113103225 = 22741^2 + 10635^2 .

It is a super-2 number, since 2×630256306² = 794446022505531272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (630256303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157564075 + ... + 157564078.

Almost surely, 2^630256306 is an apocalyptic number.

630256306 is a deficient number, since it is larger than the sum of its proper divisors (315128156).

630256306 is a wasteful number, since it uses less digits than its factorization.

630256306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315128155.

The product of its (nonzero) digits is 19440, while the sum is 31.

The square root of 630256306 is about 25104.9060145622. The cubic root of 630256306 is about 857.3781271602.

The spelling of 630256306 in words is "six hundred thirty million, two hundred fifty-six thousand, three hundred six".