996591636 has 72 divisors (see below), whose sum is σ = 2570422400. Its totient is φ = 325503360.

The previous prime is 996591623. The next prime is 996591637. The reversal of 996591636 is 636195699.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (996591637) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 394056 + ... + 396576.

Almost surely, 2^996591636 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 996591636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1285211200).

996591636 is an abundant number, since it is smaller than the sum of its proper divisors (1573830764).

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

996591636 is a wasteful number, since it uses less digits than its factorization.

996591636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2749 (or 2744 counting only the distinct ones).

The product of its digits is 2361960, while the sum is 54.

The square root of 996591636 is about 31568.8396365783. The cubic root of 996591636 is about 998.8625854453.

The spelling of 996591636 in words is "nine hundred ninety-six million, five hundred ninety-one thousand, six hundred thirty-six".