66213732 has 48 divisors (see below), whose sum is σ = 166944960. Its totient is φ = 20304768.

The previous prime is 66213713. The next prime is 66213733. The reversal of 66213732 is 23731266.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66213732.

It is not an unprimeable number, because it can be changed into a prime (66213733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64858 + ... + 65870.

It is an arithmetic number, because the mean of its divisors is an integer number (3478020).

Almost surely, 2^66213732 is an apocalyptic number.

It is an amenable number.

66213732 is an abundant number, since it is smaller than the sum of its proper divisors (100731228).

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

66213732 is a wasteful number, since it uses less digits than its factorization.

66213732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452 (or 1450 counting only the distinct ones).

The product of its digits is 9072, while the sum is 30.

The square root of 66213732 is about 8137.1820675219. The cubic root of 66213732 is about 404.5597655043.

Adding to 66213732 its reverse (23731266), we get a palindrome (89944998).

The spelling of 66213732 in words is "sixty-six million, two hundred thirteen thousand, seven hundred thirty-two".