636705 has 12 divisors (see below), whose sum is σ = 1103700. Its totient is φ = 339552.

The previous prime is 636697. The next prime is 636719. The reversal of 636705 is 507636.

636705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 439569 + 197136 = 663^2 + 444^2 .

It is not a de Polignac number, because 636705 - 2³ = 636697 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7030 + ... + 7119.

It is an arithmetic number, because the mean of its divisors is an integer number (91975).

2⁶³⁶⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

636705 is a deficient number, since it is larger than the sum of its proper divisors (466995).

636705 is a wasteful number, since it uses less digits than its factorization.

636705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14160 (or 14157 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 636705 is about 797.9379675138. The cubic root of 636705 is about 86.0292401023.

The spelling of 636705 in words is "six hundred thirty-six thousand, seven hundred five".