636538872260 has 24 divisors (see below), whose sum is σ = 1336769165760. Its totient is φ = 254608399584.

The previous prime is 636538872257. The next prime is 636538872269. The reversal of 636538872260 is 62278835636.

It is a junction number, because it is equal to n+sod(n) for n = 636538872196 and 636538872205.

It is not an unprimeable number, because it can be changed into a prime (636538872269) 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, 314927 + ... + 1171433.

It is an arithmetic number, because the mean of its divisors is an integer number (55698715240).

Almost surely, 2^636538872260 is an apocalyptic number.

It is an amenable number.

636538872260 is an abundant number, since it is smaller than the sum of its proper divisors (700230293500).

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

636538872260 is a wasteful number, since it uses less digits than its factorization.

636538872260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893675 (or 893673 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 56.

The spelling of 636538872260 in words is "six hundred thirty-six billion, five hundred thirty-eight million, eight hundred seventy-two thousand, two hundred sixty".