66385380 has 24 divisors (see below), whose sum is σ = 185879232. Its totient is φ = 17702752.

The previous prime is 66385369. The next prime is 66385399. The reversal of 66385380 is 8358366.

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 7 ways as a sum of consecutive naturals, for example, 553152 + ... + 553271.

It is an arithmetic number, because the mean of its divisors is an integer number (7744968).

Almost surely, 2^66385380 is an apocalyptic number.

66385380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66385380 is an abundant number, since it is smaller than the sum of its proper divisors (119493852).

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

66385380 is a wasteful number, since it uses less digits than its factorization.

66385380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106435 (or 1106433 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 66385380 is about 8147.7223811320. The cubic root of 66385380 is about 404.9090483158.

The spelling of 66385380 in words is "sixty-six million, three hundred eighty-five thousand, three hundred eighty".