6440616 has 96 divisors (see below), whose sum is σ = 21490560. Its totient is φ = 1696896.

The previous prime is 6440587. The next prime is 6440641. The reversal of 6440616 is 6160446.

6440616 is a `hidden beast` number, since 6 + 4 + 40 + 616 = 666.

It is a super-4 number, since 4×6440616⁴ (a number of 28 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6440616.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6061 + ... + 7043.

It is an arithmetic number, because the mean of its divisors is an integer number (223860).

Almost surely, 2^6440616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6440616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10745280).

6440616 is an abundant number, since it is smaller than the sum of its proper divisors (15049944).

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

6440616 is a wasteful number, since it uses less digits than its factorization.

6440616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015 (or 1008 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 6440616 is about 2537.8368741903. The cubic root of 6440616 is about 186.0554811945.

It can be divided in two parts, 6440 and 616, that added together give a square (7056 = 84²).

The spelling of 6440616 in words is "six million, four hundred forty thousand, six hundred sixteen".