66995940 has 96 divisors (see below), whose sum is σ = 207277056. Its totient is φ = 16032640.

The previous prime is 66995939. The next prime is 66995953. The reversal of 66995940 is 4959966.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66995940.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54169 + ... + 55391.

It is an arithmetic number, because the mean of its divisors is an integer number (2159136).

Almost surely, 2^66995940 is an apocalyptic number.

66995940 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 66995940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103638528).

66995940 is an abundant number, since it is smaller than the sum of its proper divisors (140281116).

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

66995940 is a wasteful number, since it uses less digits than its factorization.

66995940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329 (or 1327 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 48.

The square root of 66995940 is about 8185.1047641432. The cubic root of 66995940 is about 406.1466059558.

The spelling of 66995940 in words is "sixty-six million, nine hundred ninety-five thousand, nine hundred forty".