66308940 has 72 divisors (see below), whose sum is σ = 201867120. Its totient is φ = 17618304.

The previous prime is 66308927. The next prime is 66308941. The reversal of 66308940 is 4980366.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 66308895 and 66308904.

It is not an unprimeable number, because it can be changed into a prime (66308941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69547 + ... + 70493.

It is an arithmetic number, because the mean of its divisors is an integer number (2803710).

Almost surely, 2^66308940 is an apocalyptic number.

66308940 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 66308940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100933560).

66308940 is an abundant number, since it is smaller than the sum of its proper divisors (135558180).

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

66308940 is a wasteful number, since it uses less digits than its factorization.

66308940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351 (or 1346 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 66308940 is about 8143.0301485381. The cubic root of 66308940 is about 404.7535766595.

The spelling of 66308940 in words is "sixty-six million, three hundred eight thousand, nine hundred forty".