636098842 has 16 divisors (see below), whose sum is σ = 965903400. Its totient is φ = 314138880.

The previous prime is 636098779. The next prime is 636098849. The reversal of 636098842 is 248890636.

It is a happy number.

It is a Cunningham number, because it is equal to 25221²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 621953721 + 14145121 = 24939^2 + 3761^2 .

It is a junction number, because it is equal to n+sod(n) for n = 636098792 and 636098801.

It is not an unprimeable number, because it can be changed into a prime (636098849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285292 + ... + 287512.

Almost surely, 2^636098842 is an apocalyptic number.

636098842 is a deficient number, since it is larger than the sum of its proper divisors (329804558).

636098842 is a wasteful number, since it uses less digits than its factorization.

636098842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3921.

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 636098842 is about 25221.0000198247. Note that the first 4 decimals coincide. The cubic root of 636098842 is about 860.0193082018.

The spelling of 636098842 in words is "six hundred thirty-six million, ninety-eight thousand, eight hundred forty-two".