1631646036 has 72 divisors (see below), whose sum is σ = 4323219264. Its totient is φ = 517883520.

The previous prime is 1631645993. The next prime is 1631646041. The reversal of 1631646036 is 6306461361.

1631646036 is a `hidden beast` number, since 1 + 6 + 3 + 1 + 646 + 0 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 183616 + ... + 192296.

It is an arithmetic number, because the mean of its divisors is an integer number (60044712).

Almost surely, 2^1631646036 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 1631646036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2161609632).

1631646036 is an abundant number, since it is smaller than the sum of its proper divisors (2691573228).

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

1631646036 is a wasteful number, since it uses less digits than its factorization.

1631646036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8941 (or 8936 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 1631646036 is about 40393.6385585651. The cubic root of 1631646036 is about 1177.2679386356.

The spelling of 1631646036 in words is "one billion, six hundred thirty-one million, six hundred forty-six thousand, thirty-six".