2666217240 has 96 divisors (see below), whose sum is σ = 8697499200. Its totient is φ = 708341760.

The previous prime is 2666217223. The next prime is 2666217263. The reversal of 2666217240 is 427126662.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2666217195 and 2666217204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83896 + ... + 111224.

It is an arithmetic number, because the mean of its divisors is an integer number (90598950).

Almost surely, 2^2666217240 is an apocalyptic number.

2666217240 is a gapful number since it is divisible by the number (20) 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 2666217240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4348749600).

2666217240 is an abundant number, since it is smaller than the sum of its proper divisors (6031281960).

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

2666217240 is a wasteful number, since it uses less digits than its factorization.

2666217240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27617 (or 27610 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 2666217240 is about 51635.4262110811. The cubic root of 2666217240 is about 1386.6446405628.

The spelling of 2666217240 in words is "two billion, six hundred sixty-six million, two hundred seventeen thousand, two hundred forty".