6445557 has 6 divisors (see below), whose sum is σ = 9310262. Its totient is φ = 4297032.

The previous prime is 6445547. The next prime is 6445559. The reversal of 6445557 is 7555446.

It is a happy number.

6445557 is a `hidden beast` number, since 64 + 45 + 557 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5447556 + 998001 = 2334^2 + 999^2 .

It is not a de Polignac number, because 6445557 - 2⁶ = 6445493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 358078 + ... + 358095.

Almost surely, 2^6445557 is an apocalyptic number.

It is an amenable number.

6445557 is a deficient number, since it is larger than the sum of its proper divisors (2864705).

6445557 is a wasteful number, since it uses less digits than its factorization.

6445557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716179 (or 716176 counting only the distinct ones).

The product of its digits is 84000, while the sum is 36.

The square root of 6445557 is about 2538.8101543833. The cubic root of 6445557 is about 186.1030473046.

The spelling of 6445557 in words is "six million, four hundred forty-five thousand, five hundred fifty-seven".