66339840 has 176 divisors, whose sum is σ = 242888832. Its totient is φ = 15138816.

The previous prime is 66339817. The next prime is 66339857. The reversal of 66339840 is 4893366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107212 + ... + 107828.

Almost surely, 2^66339840 is an apocalyptic number.

66339840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66339840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121444416).

66339840 is an abundant number, since it is smaller than the sum of its proper divisors (176548992).

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

66339840 is a wasteful number, since it uses less digits than its factorization.

66339840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652 (or 634 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 66339840 is about 8144.9272556604. The cubic root of 66339840 is about 404.8164386873.

The spelling of 66339840 in words is "sixty-six million, three hundred thirty-nine thousand, eight hundred forty".