636930 has 64 divisors (see below), whose sum is σ = 1946880. Its totient is φ = 145152.

The previous prime is 636919. The next prime is 636931. The reversal of 636930 is 39636.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 636894 and 636903.

It is not an unprimeable number, because it can be changed into a prime (636931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1722 + ... + 2058.

It is an arithmetic number, because the mean of its divisors is an integer number (30420).

2⁶³⁶⁹³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (973440).

636930 is an abundant number, since it is smaller than the sum of its proper divisors (1309950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

636930 is a wasteful number, since it uses less digits than its factorization.

636930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 636930 is about 798.0789434636. The cubic root of 636930 is about 86.0393726332.

The spelling of 636930 in words is "six hundred thirty-six thousand, nine hundred thirty".