636474031842 has 128 divisors (see below), whose sum is σ = 1476945469440. Its totient is φ = 181071936000.

The previous prime is 636474031813. The next prime is 636474031849. The reversal of 636474031842 is 248130474636.

It is a super-2 number, since 2×636474031842² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 636474031791 and 636474031800.

It is not an unprimeable number, because it can be changed into a prime (636474031849) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9075909 + ... + 9145767.

It is an arithmetic number, because the mean of its divisors is an integer number (11538636480).

Almost surely, 2^636474031842 is an apocalyptic number.

636474031842 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 636474031842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (738472734720).

636474031842 is an abundant number, since it is smaller than the sum of its proper divisors (840471437598).

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

636474031842 is a wasteful number, since it uses less digits than its factorization.

636474031842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70040.

The product of its (nonzero) digits is 2322432, while the sum is 48.

The spelling of 636474031842 in words is "six hundred thirty-six billion, four hundred seventy-four million, thirty-one thousand, eight hundred forty-two".