6446244840 has 64 divisors (see below), whose sum is σ = 22101413760. Its totient is φ = 1473427200.

The previous prime is 6446244829. The next prime is 6446244859. The reversal of 6446244840 is 484426446.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 6446244792 and 6446244801.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3836211 + ... + 3837890.

It is an arithmetic number, because the mean of its divisors is an integer number (345334590).

Almost surely, 2^6446244840 is an apocalyptic number.

6446244840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6446244840 is an abundant number, since it is smaller than the sum of its proper divisors (15655168920).

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

6446244840 is a wasteful number, since it uses less digits than its factorization.

6446244840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7674122 (or 7674118 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 42.

The square root of 6446244840 is about 80288.5100123299. The cubic root of 6446244840 is about 1861.0966708760.

The spelling of 6446244840 in words is "six billion, four hundred forty-six million, two hundred forty-four thousand, eight hundred forty".