66572320 has 24 divisors (see below), whose sum is σ = 157277484. Its totient is φ = 26628864.

The previous prime is 66572279. The next prime is 66572321. The reversal of 66572320 is 2327566.

66572320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 66520336 + 51984 = 8156^2 + 228^2 .

It is not an unprimeable number, because it can be changed into a prime (66572321) 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 3 ways as a sum of consecutive naturals, for example, 207879 + ... + 208198.

Almost surely, 2^66572320 is an apocalyptic number.

It is an amenable number.

66572320 is an abundant number, since it is smaller than the sum of its proper divisors (90705164).

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

66572320 is a wasteful number, since it uses less digits than its factorization.

66572320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416092 (or 416084 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 66572320 is about 8159.1862339329. The cubic root of 66572320 is about 405.2887642400.

Adding to 66572320 its reverse (2327566), we get a palindrome (68899886).

The spelling of 66572320 in words is "sixty-six million, five hundred seventy-two thousand, three hundred twenty".