630710257 has 4 divisors (see below), whose sum is σ = 646093476. Its totient is φ = 615327040.

The previous prime is 630710237. The next prime is 630710261. The reversal of 630710257 is 752017036.

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

It can be written as a sum of positive squares in 2 ways, for example, as 259338816 + 371371441 = 16104^2 + 19271^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-630710257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630710237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7691548 + ... + 7691629.

It is an arithmetic number, because the mean of its divisors is an integer number (161523369).

Almost surely, 2^630710257 is an apocalyptic number.

It is an amenable number.

630710257 is a deficient number, since it is larger than the sum of its proper divisors (15383219).

630710257 is a wasteful number, since it uses less digits than its factorization.

630710257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15383218.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 630710257 is about 25113.9454686037. The cubic root of 630710257 is about 857.5839239912.

The spelling of 630710257 in words is "six hundred thirty million, seven hundred ten thousand, two hundred fifty-seven".