630761 has 4 divisors (see below), whose sum is σ = 632400. Its totient is φ = 629124.

The previous prime is 630737. The next prime is 630797. The reversal of 630761 is 167036.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 630761 - 2¹⁰ = 629737 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (630701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110 + ... + 1128.

It is an arithmetic number, because the mean of its divisors is an integer number (158100).

2⁶³⁰⁷⁶¹ is an apocalyptic number.

It is an amenable number.

630761 is a deficient number, since it is larger than the sum of its proper divisors (1639).

630761 is a wasteful number, since it uses less digits than its factorization.

630761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 630761 is about 794.2046335800. The cubic root of 630761 is about 85.7606921986.

Adding to 630761 its reverse (167036), we get a palindrome (797797).

The spelling of 630761 in words is "six hundred thirty thousand, seven hundred sixty-one".