840309491568 has 40 divisors (see below), whose sum is σ = 2171711532816. Its totient is φ = 279985484800.

The previous prime is 840309491473. The next prime is 840309491569. The reversal of 840309491568 is 865194903048.

It is a super-2 number, since 2×840309491568² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840309491569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3561993 + ... + 3790568.

Almost surely, 2^840309491568 is an apocalyptic number.

It is an amenable number.

840309491568 is an abundant number, since it is smaller than the sum of its proper divisors (1331402041248).

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

840309491568 is a wasteful number, since it uses less digits than its factorization.

840309491568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7354953 (or 7354947 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 57.

The spelling of 840309491568 in words is "eight hundred forty billion, three hundred nine million, four hundred ninety-one thousand, five hundred sixty-eight".