66732320 has 48 divisors (see below), whose sum is σ = 158147640. Its totient is φ = 26609664.

The previous prime is 66732319. The next prime is 66732329. The reversal of 66732320 is 2323766.

It can be written as a sum of positive squares in 4 ways, for example, as 59783824 + 6948496 = 7732^2 + 2636^2 .

It is not an unprimeable number, because it can be changed into a prime (66732329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90674 + ... + 91406.

Almost surely, 2^66732320 is an apocalyptic number.

It is an amenable number.

66732320 is an abundant number, since it is smaller than the sum of its proper divisors (91415320).

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

66732320 is a wasteful number, since it uses less digits than its factorization.

66732320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317 (or 1309 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 29.

The square root of 66732320 is about 8168.9852490992. The cubic root of 66732320 is about 405.6131949797.

The spelling of 66732320 in words is "sixty-six million, seven hundred thirty-two thousand, three hundred twenty".