66742232 has 8 divisors (see below), whose sum is σ = 125141700. Its totient is φ = 33371112.

The previous prime is 66742199. The next prime is 66742237. The reversal of 66742232 is 23224766.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66742237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4171382 + ... + 4171397.

Almost surely, 2^66742232 is an apocalyptic number.

It is an amenable number.

66742232 is a deficient number, since it is larger than the sum of its proper divisors (58399468).

66742232 is a wasteful number, since it uses less digits than its factorization.

66742232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8342785 (or 8342781 counting only the distinct ones).

The product of its digits is 24192, while the sum is 32.

The square root of 66742232 is about 8169.5919114727. The cubic root of 66742232 is about 405.6332763982.

Adding to 66742232 its reverse (23224766), we get a palindrome (89966998).

The spelling of 66742232 in words is "sixty-six million, seven hundred forty-two thousand, two hundred thirty-two".