66609472 has 56 divisors (see below), whose sum is σ = 141768576. Its totient is φ = 30970368.

The previous prime is 66609463. The next prime is 66609493. The reversal of 66609472 is 27490666.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 53853 + ... + 55075.

Almost surely, 2^66609472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66609472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70884288).

66609472 is an abundant number, since it is smaller than the sum of its proper divisors (75159104).

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

66609472 is a wasteful number, since it uses less digits than its factorization.

66609472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295 (or 1285 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 66609472 is about 8161.4626140172. The cubic root of 66609472 is about 405.3641433567.

It can be divided in two parts, 66609 and 472, that added together give a square (67081 = 259²).

The spelling of 66609472 in words is "sixty-six million, six hundred nine thousand, four hundred seventy-two".