636164442 has 20 divisors (see below), whose sum is σ = 1425479946. Its totient is φ = 212054760.

The previous prime is 636164437. The next prime is 636164443. The reversal of 636164442 is 244461636.

636164442 is a `hidden beast` number, since 6 + 3 + 6 + 1 + 644 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 635493681 + 670761 = 25209^2 + 819^2 .

It is a junction number, because it is equal to n+sod(n) for n = 636164397 and 636164406.

It is not an unprimeable number, because it can be changed into a prime (636164443) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1963309 + ... + 1963632.

Almost surely, 2^636164442 is an apocalyptic number.

636164442 is an abundant number, since it is smaller than the sum of its proper divisors (789315504).

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

636164442 is a wasteful number, since it uses less digits than its factorization.

636164442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3926955 (or 3926946 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 636164442 is about 25222.3004898443. The cubic root of 636164442 is about 860.0488713889.

The spelling of 636164442 in words is "six hundred thirty-six million, one hundred sixty-four thousand, four hundred forty-two".