6440850 has 96 divisors (see below), whose sum is σ = 19165440. Its totient is φ = 1581120.

The previous prime is 6440831. The next prime is 6440873. The reversal of 6440850 is 580446.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17367 + ... + 17733.

It is an arithmetic number, because the mean of its divisors is an integer number (199640).

Almost surely, 2^6440850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6440850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9582720).

6440850 is an abundant number, since it is smaller than the sum of its proper divisors (12724590).

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

6440850 is a wasteful number, since it uses less digits than its factorization.

6440850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 6440850 is about 2537.8829760255. The cubic root of 6440850 is about 186.0577344187.

The spelling of 6440850 in words is "six million, four hundred forty thousand, eight hundred fifty".