1641687996 has 24 divisors (see below), whose sum is σ = 4125267664. Its totient is φ = 505134720.

The previous prime is 1641687967. The next prime is 1641688007. The reversal of 1641687996 is 6997861461.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5261665 + ... + 5261976.

Almost surely, 2^1641687996 is an apocalyptic number.

It is an amenable number.

1641687996 is an abundant number, since it is smaller than the sum of its proper divisors (2483579668).

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

1641687996 is a wasteful number, since it uses less digits than its factorization.

1641687996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10523661 (or 10523659 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 57.

The square root of 1641687996 is about 40517.7491477501. The cubic root of 1641687996 is about 1179.6781646479.

The spelling of 1641687996 in words is "one billion, six hundred forty-one million, six hundred eighty-seven thousand, nine hundred ninety-six".