66504380 has 12 divisors (see below), whose sum is σ = 139659240. Its totient is φ = 26601744.

The previous prime is 66504371. The next prime is 66504421. The reversal of 66504380 is 8340566.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1662590 + ... + 1662629.

It is an arithmetic number, because the mean of its divisors is an integer number (11638270).

Almost surely, 2^66504380 is an apocalyptic number.

It is an amenable number.

66504380 is an abundant number, since it is smaller than the sum of its proper divisors (73154860).

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

66504380 is a wasteful number, since it uses less digits than its factorization.

66504380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3325228 (or 3325226 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 66504380 is about 8155.0217657588. The cubic root of 66504380 is about 405.1508456028.

The spelling of 66504380 in words is "sixty-six million, five hundred four thousand, three hundred eighty".