66698240 has 88 divisors (see below), whose sum is σ = 182952672. Its totient is φ = 22855680.

The previous prime is 66698209. The next prime is 66698243. The reversal of 66698240 is 4289666.

66698240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66698243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34910 + ... + 36770.

Almost surely, 2^66698240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66698240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91476336).

66698240 is an abundant number, since it is smaller than the sum of its proper divisors (116254432).

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

66698240 is a wasteful number, since it uses less digits than its factorization.

66698240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893 (or 1875 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 66698240 is about 8166.8990443130. The cubic root of 66698240 is about 405.5441347326.

The spelling of 66698240 in words is "sixty-six million, six hundred ninety-eight thousand, two hundred forty".