635945391960 has 128 divisors (see below), whose sum is σ = 1960308725760. Its totient is φ = 164953958400.

The previous prime is 635945391947. The next prime is 635945392013. The reversal of 635945391960 is 69193549536.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 635945391894 and 635945391903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 987865 + ... + 1499255.

It is an arithmetic number, because the mean of its divisors is an integer number (15314911920).

Almost surely, 2^635945391960 is an apocalyptic number.

635945391960 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 635945391960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (980154362880).

635945391960 is an abundant number, since it is smaller than the sum of its proper divisors (1324363333800).

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

635945391960 is a wasteful number, since it uses less digits than its factorization.

635945391960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511689 (or 511685 counting only the distinct ones).

The product of its (nonzero) digits is 23619600, while the sum is 60.

The spelling of 635945391960 in words is "six hundred thirty-five billion, nine hundred forty-five million, three hundred ninety-one thousand, nine hundred sixty".