636754 has 4 divisors (see below), whose sum is σ = 955134. Its totient is φ = 318376.

The previous prime is 636749. The next prime is 636761. The reversal of 636754 is 457636.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 585225 + 51529 = 765^2 + 227^2 .

It is a super-3 number, since 3×636754³ = 774526533327567192, which contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

636754 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159187 + ... + 159190.

2⁶³⁶⁷⁵⁴ is an apocalyptic number.

636754 is a deficient number, since it is larger than the sum of its proper divisors (318380).

636754 is a wasteful number, since it uses less digits than its factorization.

636754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318379.

The product of its digits is 15120, while the sum is 31.

The square root of 636754 is about 797.9686710642. The cubic root of 636754 is about 86.0314469456.

The spelling of 636754 in words is "six hundred thirty-six thousand, seven hundred fifty-four".