6671440 has 40 divisors (see below), whose sum is σ = 15702120. Its totient is φ = 2635776.

The previous prime is 6671411. The next prime is 6671443. The reversal of 6671440 is 441766.

6671440 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 97344 + 6574096 = 312^2 + 2564^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×6671440² = 89016223347200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6671399 and 6671408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6671443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6652 + ... + 7588.

It is an arithmetic number, because the mean of its divisors is an integer number (392553).

Almost surely, 2^6671440 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 6671440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7851060).

6671440 is an abundant number, since it is smaller than the sum of its proper divisors (9030680).

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

6671440 is a wasteful number, since it uses less digits than its factorization.

6671440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039 (or 1033 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 6671440 is about 2582.9130840971. The cubic root of 6671440 is about 188.2521138463.

The spelling of 6671440 in words is "six million, six hundred seventy-one thousand, four hundred forty".