634644864528 has 160 divisors (see below), whose sum is σ = 1715448109056. Its totient is φ = 201981233664.

The previous prime is 634644864523. The next prime is 634644864533. The reversal of 634644864528 is 825468446436.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (634644864523) and next prime (634644864533).

It is not an unprimeable number, because it can be changed into a prime (634644864523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87982650 + ... + 87989862.

Almost surely, 2^634644864528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634644864528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (857724054528).

634644864528 is an abundant number, since it is smaller than the sum of its proper divisors (1080803244528).

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

634644864528 is a wasteful number, since it uses less digits than its factorization.

634644864528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8221 (or 8215 counting only the distinct ones).

The product of its digits is 106168320, while the sum is 60.

The spelling of 634644864528 in words is "six hundred thirty-four billion, six hundred forty-four million, eight hundred sixty-four thousand, five hundred twenty-eight".