66408384 has 56 divisors (see below), whose sum is σ = 200810368. Its totient is φ = 18973440.

The previous prime is 66408371. The next prime is 66408389. The reversal of 66408384 is 48380466.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66408389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23362 + ... + 26049.

Almost surely, 2^66408384 is an apocalyptic number.

66408384 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66408384 is an abundant number, since it is smaller than the sum of its proper divisors (134401984).

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

66408384 is a wasteful number, since it uses less digits than its factorization.

66408384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49433 (or 49423 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 66408384 is about 8149.1339417143. The cubic root of 66408384 is about 404.9558128899.

The spelling of 66408384 in words is "sixty-six million, four hundred eight thousand, three hundred eighty-four".