66753390 has 128 divisors (see below), whose sum is σ = 188739072. Its totient is φ = 14929920.

The previous prime is 66753377. The next prime is 66753391. The reversal of 66753390 is 9335766.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66753391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 409449 + ... + 409611.

It is an arithmetic number, because the mean of its divisors is an integer number (1474524).

Almost surely, 2^66753390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66753390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94369536).

66753390 is an abundant number, since it is smaller than the sum of its proper divisors (121985682).

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

66753390 is a wasteful number, since it uses less digits than its factorization.

66753390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274.

The product of its (nonzero) digits is 102060, while the sum is 39.

The square root of 66753390 is about 8170.2747811809. The cubic root of 66753390 is about 405.6558797972.

The spelling of 66753390 in words is "sixty-six million, seven hundred fifty-three thousand, three hundred ninety".