6445756 has 6 divisors (see below), whose sum is σ = 11280080. Its totient is φ = 3222876.

The previous prime is 6445753. The next prime is 6445757. The reversal of 6445756 is 6575446.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805716 + ... + 805723.

Almost surely, 2^6445756 is an apocalyptic number.

It is an amenable number.

6445756 is a deficient number, since it is larger than the sum of its proper divisors (4834324).

6445756 is a wasteful number, since it uses less digits than its factorization.

6445756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611443 (or 1611441 counting only the distinct ones).

The product of its digits is 100800, while the sum is 37.

The square root of 6445756 is about 2538.8493456682. The cubic root of 6445756 is about 186.1049625321.

It can be divided in two parts, 644 and 5756, that added together give a square (6400 = 80²).

The spelling of 6445756 in words is "six million, four hundred forty-five thousand, seven hundred fifty-six".