66388032 has 112 divisors (see below), whose sum is σ = 197591680. Its totient is φ = 21855744.

The previous prime is 66388013. The next prime is 66388073. The reversal of 66388032 is 23088366.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177798 + ... + 178170.

Almost surely, 2^66388032 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 66388032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98795840).

66388032 is an abundant number, since it is smaller than the sum of its proper divisors (131203648).

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

66388032 is a wasteful number, since it uses less digits than its factorization.

66388032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497 (or 481 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 66388032 is about 8147.8851243743. The cubic root of 66388032 is about 404.9144400878.

The spelling of 66388032 in words is "sixty-six million, three hundred eighty-eight thousand, thirty-two".