630856 has 8 divisors (see below), whose sum is σ = 1182870. Its totient is φ = 315424.

The previous prime is 630841. The next prime is 630863. The reversal of 630856 is 658036.

It can be written as a sum of positive squares in only one way, i.e., 586756 + 44100 = 766^2 + 210^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39421 + ... + 39436.

2⁶³⁰⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

630856 is a deficient number, since it is larger than the sum of its proper divisors (552014).

630856 is a wasteful number, since it uses less digits than its factorization.

630856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78863 (or 78859 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 630856 is about 794.2644395918. The cubic root of 630856 is about 85.7649975043.

It can be divided in two parts, 6 and 30856, that multiplied together give a triangular number (185136 = T₆₀₈).

The spelling of 630856 in words is "six hundred thirty thousand, eight hundred fifty-six".