66323730 has 80 divisors (see below), whose sum is σ = 176253120. Its totient is φ = 15972000.

The previous prime is 66323717. The next prime is 66323731. The reversal of 66323730 is 3732366.

It is a super-2 number, since 2×66323730² = 8797674322225800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (66323731) 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 39 ways as a sum of consecutive naturals, for example, 439155 + ... + 439305.

It is an arithmetic number, because the mean of its divisors is an integer number (2203164).

Almost surely, 2^66323730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66323730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88126560).

66323730 is an abundant number, since it is smaller than the sum of its proper divisors (109929390).

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

66323730 is a wasteful number, since it uses less digits than its factorization.

66323730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 30.

The square root of 66323730 is about 8143.9382365045. The cubic root of 66323730 is about 404.7836674255.

The spelling of 66323730 in words is "sixty-six million, three hundred twenty-three thousand, seven hundred thirty".