631985536 has 192 divisors, whose sum is σ = 1650710880. Its totient is φ = 238436352.

The previous prime is 631985533. The next prime is 631985569. The reversal of 631985536 is 635589136.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631985531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1875160 + ... + 1875496.

Almost surely, 2^631985536 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 631985536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (825355440).

631985536 is an abundant number, since it is smaller than the sum of its proper divisors (1018725344).

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

631985536 is a wasteful number, since it uses less digits than its factorization.

631985536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 382 counting only the distinct ones).

The product of its digits is 583200, while the sum is 46.

The square root of 631985536 is about 25139.3225047932. The cubic root of 631985536 is about 858.1615386553.

The spelling of 631985536 in words is "six hundred thirty-one million, nine hundred eighty-five thousand, five hundred thirty-six".