66039930 has 96 divisors (see below), whose sum is σ = 191999808. Its totient is φ = 15609600.

The previous prime is 66039913. The next prime is 66039943. The reversal of 66039930 is 3993066.

It is a super-2 number, since 2×66039930² = 8722544708809800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39777 + ... + 41403.

It is an arithmetic number, because the mean of its divisors is an integer number (1999998).

Almost surely, 2^66039930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66039930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95999904).

66039930 is an abundant number, since it is smaller than the sum of its proper divisors (125959878).

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

66039930 is a wasteful number, since it uses less digits than its factorization.

66039930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692 (or 1689 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 36.

The square root of 66039930 is about 8126.4955546656. The cubic root of 66039930 is about 404.2054839727.

The spelling of 66039930 in words is "sixty-six million, thirty-nine thousand, nine hundred thirty".