66744432 has 40 divisors (see below), whose sum is σ = 191582480. Its totient is φ = 22248000.

The previous prime is 66744427. The next prime is 66744443. The reversal of 66744432 is 23444766.

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

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, 76819 + ... + 77682.

It is an arithmetic number, because the mean of its divisors is an integer number (4789562).

Almost surely, 2^66744432 is an apocalyptic number.

It is an amenable number.

66744432 is an abundant number, since it is smaller than the sum of its proper divisors (124838048).

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

66744432 is a wasteful number, since it uses less digits than its factorization.

66744432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154518 (or 154506 counting only the distinct ones).

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

The square root of 66744432 is about 8169.7265560115. The cubic root of 66744432 is about 405.6377332635.

It can be divided in two parts, 66744 and 432, that added together give a palindrome (67176).

The spelling of 66744432 in words is "sixty-six million, seven hundred forty-four thousand, four hundred thirty-two".