66753240 has 64 divisors (see below), whose sum is σ = 201519360. Its totient is φ = 17688960.

The previous prime is 66753233. The next prime is 66753241. The reversal of 66753240 is 4235766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66753241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18375 + ... + 21705.

It is an arithmetic number, because the mean of its divisors is an integer number (3148740).

Almost surely, 2^66753240 is an apocalyptic number.

66753240 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 66753240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100759680).

66753240 is an abundant number, since it is smaller than the sum of its proper divisors (134766120).

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

66753240 is a wasteful number, since it uses less digits than its factorization.

66753240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3512 (or 3508 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 66753240 is about 8170.2656015579. The cubic root of 66753240 is about 405.6555759503.

The spelling of 66753240 in words is "sixty-six million, seven hundred fifty-three thousand, two hundred forty".