6441780 has 48 divisors (see below), whose sum is σ = 18232704. Its totient is φ = 1699200.

The previous prime is 6441763. The next prime is 6441833. The reversal of 6441780 is 871446.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 5529 + ... + 6591.

It is an arithmetic number, because the mean of its divisors is an integer number (379848).

Almost surely, 2^6441780 is an apocalyptic number.

6441780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6441780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9116352).

6441780 is an abundant number, since it is smaller than the sum of its proper divisors (11790924).

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

6441780 is a wasteful number, since it uses less digits than its factorization.

6441780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176 (or 1174 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 6441780 is about 2538.0661929902. The cubic root of 6441780 is about 186.0666890011.

The spelling of 6441780 in words is "six million, four hundred forty-one thousand, seven hundred eighty".