66220732 has 6 divisors (see below), whose sum is σ = 115886288. Its totient is φ = 33110364.

The previous prime is 66220727. The next prime is 66220733. The reversal of 66220732 is 23702266.

It is a self number, because there is not a number n which added to its sum of digits gives 66220732.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66220733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8277588 + ... + 8277595.

Almost surely, 2^66220732 is an apocalyptic number.

It is an amenable number.

66220732 is a deficient number, since it is larger than the sum of its proper divisors (49665556).

66220732 is a wasteful number, since it uses less digits than its factorization.

66220732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16555187 (or 16555185 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 66220732 is about 8137.6121804864. The cubic root of 66220732 is about 404.5740214523.

Adding to 66220732 its reverse (23702266), we get a palindrome (89922998).

The spelling of 66220732 in words is "sixty-six million, two hundred twenty thousand, seven hundred thirty-two".