1641781068 has 24 divisors (see below), whose sum is σ = 3864726768. Its totient is φ = 542416896.

The previous prime is 1641781003. The next prime is 1641781073. The reversal of 1641781068 is 8601871461.

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, 604021 + ... + 606732.

It is an arithmetic number, because the mean of its divisors is an integer number (161030282).

Almost surely, 2^1641781068 is an apocalyptic number.

It is an amenable number.

1641781068 is an abundant number, since it is smaller than the sum of its proper divisors (2222945700).

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

1641781068 is a wasteful number, since it uses less digits than its factorization.

1641781068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210873 (or 1210871 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 1641781068 is about 40518.8976651636. The cubic root of 1641781068 is about 1179.7004573393.

The spelling of 1641781068 in words is "one billion, six hundred forty-one million, seven hundred eighty-one thousand, sixty-eight".