240642666 has 24 divisors (see below), whose sum is σ = 568792224. Its totient is φ = 72921960.

The previous prime is 240642641. The next prime is 240642671. The reversal of 240642666 is 666246042.

It is a self number, because there is not a number n which added to its sum of digits gives 240642666.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 607486 + ... + 607881.

It is an arithmetic number, because the mean of its divisors is an integer number (23699676).

Almost surely, 2^240642666 is an apocalyptic number.

240642666 is an abundant number, since it is smaller than the sum of its proper divisors (328149558).

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

240642666 is a wasteful number, since it uses less digits than its factorization.

240642666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215386 (or 1215383 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 240642666 is about 15512.6614737768. The cubic root of 240642666 is about 622.0007047755. Note that the first 3 decimals are identical.

The spelling of 240642666 in words is "two hundred forty million, six hundred forty-two thousand, six hundred sixty-six".