636100090 has 8 divisors (see below), whose sum is σ = 1144980180. Its totient is φ = 254440032.

The previous prime is 636100079. The next prime is 636100093. The reversal of 636100090 is 90001636.

It can be written as a sum of positive squares in 2 ways, for example, as 607080321 + 29019769 = 24639^2 + 5387^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (636100093) 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, 31804995 + ... + 31805014.

Almost surely, 2^636100090 is an apocalyptic number.

636100090 is a deficient number, since it is larger than the sum of its proper divisors (508880090).

636100090 is a wasteful number, since it uses less digits than its factorization.

636100090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63610016.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 636100090 is about 25221.0247610996. The cubic root of 636100090 is about 860.0198706424.

The spelling of 636100090 in words is "six hundred thirty-six million, one hundred thousand, ninety".