66600240 has 160 divisors (see below), whose sum is σ = 244270080. Its totient is φ = 14687232.

The previous prime is 66600229. The next prime is 66600241. The reversal of 66600240 is 4200666.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 66600240.

It is not an unprimeable number, because it can be changed into a prime (66600241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48037 + ... + 49403.

It is an arithmetic number, because the mean of its divisors is an integer number (1526688).

Almost surely, 2^66600240 is an apocalyptic number.

66600240 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 66600240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122135040).

66600240 is an abundant number, since it is smaller than the sum of its proper divisors (177669840).

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

66600240 is a wasteful number, since it uses less digits than its factorization.

66600240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419 (or 1413 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 66600240 is about 8160.8970095205. The cubic root of 66600240 is about 405.3454148157.

The spelling of 66600240 in words is "sixty-six million, six hundred thousand, two hundred forty".