256001630 has 16 divisors (see below), whose sum is σ = 485056080. Its totient is φ = 97011072.

The previous prime is 256001609. The next prime is 256001639. The reversal of 256001630 is 36100652.

256001630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 256001596 and 256001605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256001639) 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, 673499 + ... + 673878.

It is an arithmetic number, because the mean of its divisors is an integer number (30316005).

Almost surely, 2^256001630 is an apocalyptic number.

256001630 is a deficient number, since it is larger than the sum of its proper divisors (229054450).

256001630 is a wasteful number, since it uses less digits than its factorization.

256001630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347403.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 256001630 is about 16000.0509374189. The cubic root of 256001630 is about 634.9617684218.

The spelling of 256001630 in words is "two hundred fifty-six million, one thousand, six hundred thirty".