630681 has 8 divisors (see below), whose sum is σ = 860640. Its totient is φ = 410592.

The previous prime is 630677. The next prime is 630689. The reversal of 630681 is 186036.

630681 is nontrivially palindromic in base 2 and base 16.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 630681 - 2² = 630677 is a prime.

It is a super-3 number, since 3×630681³ = 752576230572333723, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an Ulam number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 630681.

It is not an unprimeable number, because it can be changed into a prime (630689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2316 + ... + 2573.

It is an arithmetic number, because the mean of its divisors is an integer number (107580).

2⁶³⁰⁶⁸¹ is an apocalyptic number.

It is an amenable number.

630681 is a deficient number, since it is larger than the sum of its proper divisors (229959).

630681 is a wasteful number, since it uses less digits than its factorization.

630681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4935.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 630681 is about 794.1542671295. The cubic root of 630681 is about 85.7570663427.

The spelling of 630681 in words is "six hundred thirty thousand, six hundred eighty-one".