6400544 has 12 divisors (see below), whose sum is σ = 12601134. Its totient is φ = 3200256.

The previous prime is 6400543. The next prime is 6400591. The reversal of 6400544 is 4450046.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6250000 + 150544 = 2500^2 + 388^2 .

It is not an unprimeable number, because it can be changed into a prime (6400543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99977 + ... + 100040.

Almost surely, 2^6400544 is an apocalyptic number.

It is an amenable number.

6400544 is a deficient number, since it is larger than the sum of its proper divisors (6200590).

6400544 is a wasteful number, since it uses less digits than its factorization.

6400544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200027 (or 200019 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 6400544 is about 2529.9296432905. The cubic root of 6400544 is about 185.6688136628.

The spelling of 6400544 in words is "six million, four hundred thousand, five hundred forty-four".