66444732 has 24 divisors (see below), whose sum is σ = 172264400. Its totient is φ = 22148208.

The previous prime is 66444731. The next prime is 66444739. The reversal of 66444732 is 23744466.

66444732 is a `hidden beast` number, since 6 + 644 + 4 + 7 + 3 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66444731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307507 + ... + 307722.

Almost surely, 2^66444732 is an apocalyptic number.

It is an amenable number.

66444732 is an abundant number, since it is smaller than the sum of its proper divisors (105819668).

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

66444732 is a wasteful number, since it uses less digits than its factorization.

66444732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615242 (or 615234 counting only the distinct ones).

The product of its digits is 96768, while the sum is 36.

The square root of 66444732 is about 8151.3638122709. The cubic root of 66444732 is about 405.0296823239.

It can be divided in two parts, 66444 and 732, that added together give a palindrome (67176).

The spelling of 66444732 in words is "sixty-six million, four hundred forty-four thousand, seven hundred thirty-two".