66648078 has 96 divisors (see below), whose sum is σ = 173002752. Its totient is φ = 18144000.

The previous prime is 66648073. The next prime is 66648079. The reversal of 66648078 is 87084666.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66648073) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 441303 + ... + 441453.

It is an arithmetic number, because the mean of its divisors is an integer number (1802112).

Almost surely, 2^66648078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66648078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86501376).

66648078 is an abundant number, since it is smaller than the sum of its proper divisors (106354674).

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

66648078 is a wasteful number, since it uses less digits than its factorization.

66648078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 66648078 is about 8163.8274112085. The cubic root of 66648078 is about 405.4424428598.

The spelling of 66648078 in words is "sixty-six million, six hundred forty-eight thousand, seventy-eight".