66443456 has 56 divisors (see below), whose sum is σ = 140421360. Its totient is φ = 31104000.

The previous prime is 66443449. The next prime is 66443467. The reversal of 66443456 is 65434466.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122546 + ... + 123086.

Almost surely, 2^66443456 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 66443456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70210680).

66443456 is an abundant number, since it is smaller than the sum of its proper divisors (73977904).

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

66443456 is a wasteful number, since it uses less digits than its factorization.

66443456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673 (or 663 counting only the distinct ones).

The product of its digits is 207360, while the sum is 38.

The square root of 66443456 is about 8151.2855427840. The cubic root of 66443456 is about 405.0270895867.

The spelling of 66443456 in words is "sixty-six million, four hundred forty-three thousand, four hundred fifty-six".