66991232 has 96 divisors (see below), whose sum is σ = 169536240. Its totient is φ = 26073600.

The previous prime is 66991231. The next prime is 66991241. The reversal of 66991232 is 23219966.

66991232 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66991231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68507 + ... + 69477.

Almost surely, 2^66991232 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 66991232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84768120).

66991232 is an abundant number, since it is smaller than the sum of its proper divisors (102545008).

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

66991232 is a wasteful number, since it uses less digits than its factorization.

66991232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010 (or 991 counting only the distinct ones).

The product of its digits is 34992, while the sum is 38.

The square root of 66991232 is about 8184.8171635046. The cubic root of 66991232 is about 406.1370920310.

The spelling of 66991232 in words is "sixty-six million, nine hundred ninety-one thousand, two hundred thirty-two".