1641688412 has 96 divisors (see below), whose sum is σ = 3619445760. Its totient is φ = 634314240.

The previous prime is 1641688403. The next prime is 1641688417. The reversal of 1641688412 is 2148861461.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1641688412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641688417) 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, 3592088 + ... + 3592544.

It is an arithmetic number, because the mean of its divisors is an integer number (37702560).

Almost surely, 2^1641688412 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 1641688412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1809722880).

1641688412 is an abundant number, since it is smaller than the sum of its proper divisors (1977757348).

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

1641688412 is a wasteful number, since it uses less digits than its factorization.

1641688412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691 (or 689 counting only the distinct ones).

The product of its digits is 73728, while the sum is 41.

The square root of 1641688412 is about 40517.7542813024. The cubic root of 1641688412 is about 1179.6782642905.

The spelling of 1641688412 in words is "one billion, six hundred forty-one million, six hundred eighty-eight thousand, four hundred twelve".