6475644 has 54 divisors (see below), whose sum is σ = 19046664. Its totient is φ = 1849680.

The previous prime is 6475643. The next prime is 6475649. The reversal of 6475644 is 4465746.

6475644 is a `hidden beast` number, since 6 + 4 + 7 + 5 + 644 = 666.

6475644 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a d-powerful number, because it can be written as 6⁶ + 4⁴ + 7³ + 5⁹ + 6⁷ + 4⁵ + 4¹¹ .

It is a junction number, because it is equal to n+sod(n) for n = 6475599 and 6475608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6475643) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 72 + ... + 3599.

It is an arithmetic number, because the mean of its divisors is an integer number (352716).

Almost surely, 2^6475644 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 6475644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9523332).

6475644 is an abundant number, since it is smaller than the sum of its proper divisors (12571020).

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

6475644 is a wasteful number, since it uses less digits than its factorization.

6475644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3695 (or 3683 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 6475644 is about 2544.7286692298. The cubic root of 6475644 is about 186.3921659782.

The spelling of 6475644 in words is "six million, four hundred seventy-five thousand, six hundred forty-four".