6440842306 has 32 divisors (see below), whose sum is σ = 10358046720. Its totient is φ = 2996641296.

The previous prime is 6440842301. The next prime is 6440842313. The reversal of 6440842306 is 6032480446.

It is a super-2 number, since 2×6440842306² = 82968899221518795272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6440842301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 352135 + ... + 369973.

It is an arithmetic number, because the mean of its divisors is an integer number (323688960).

Almost surely, 2^6440842306 is an apocalyptic number.

6440842306 is a deficient number, since it is larger than the sum of its proper divisors (3917204414).

6440842306 is a wasteful number, since it uses less digits than its factorization.

6440842306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18078.

The product of its (nonzero) digits is 110592, while the sum is 37.

The square root of 6440842306 is about 80254.8584572922. The cubic root of 6440842306 is about 1860.5766033277.

The spelling of 6440842306 in words is "six billion, four hundred forty million, eight hundred forty-two thousand, three hundred six".