636346673 has 4 divisors (see below), whose sum is σ = 648353268. Its totient is φ = 624340080.

The previous prime is 636346661. The next prime is 636346679. The reversal of 636346673 is 376643636.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 257538304 + 378808369 = 16048^2 + 19463^2 .

It is a cyclic number.

It is not a de Polignac number, because 636346673 - 2⁴ = 636346657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (636346679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6003218 + ... + 6003323.

It is an arithmetic number, because the mean of its divisors is an integer number (162088317).

Almost surely, 2^636346673 is an apocalyptic number.

It is an amenable number.

636346673 is a deficient number, since it is larger than the sum of its proper divisors (12006595).

636346673 is a wasteful number, since it uses less digits than its factorization.

636346673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12006594.

The product of its digits is 979776, while the sum is 44.

The square root of 636346673 is about 25225.9127287795. The cubic root of 636346673 is about 860.1309846461.

It can be divided in two parts, 63634 and 6673, that added together give a palindrome (70307).

The spelling of 636346673 in words is "six hundred thirty-six million, three hundred forty-six thousand, six hundred seventy-three".