6440842842 has 16 divisors (see below), whose sum is σ = 14721926592. Its totient is φ = 1840240800.

The previous prime is 6440842757. The next prime is 6440842843. The reversal of 6440842842 is 2482480446.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 153353401 = 6440842842 / (6 + 4 + 4 + 0 + 8 + 4 + 2 + 8 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 6440842794 and 6440842803.

It is not an unprimeable number, because it can be changed into a prime (6440842843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76676659 + ... + 76676742.

It is an arithmetic number, because the mean of its divisors is an integer number (920120412).

Almost surely, 2^6440842842 is an apocalyptic number.

6440842842 is an abundant number, since it is smaller than the sum of its proper divisors (8281083750).

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

6440842842 is a wasteful number, since it uses less digits than its factorization.

6440842842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153353413.

The product of its (nonzero) digits is 393216, while the sum is 42.

The square root of 6440842842 is about 80254.8617966538. The cubic root of 6440842842 is about 1860.5766549395.

The spelling of 6440842842 in words is "six billion, four hundred forty million, eight hundred forty-two thousand, eight hundred forty-two".