240640656 has 20 divisors (see below), whose sum is σ = 621655152. Its totient is φ = 80213536.

The previous prime is 240640639. The next prime is 240640663. The reversal of 240640656 is 656046042.

240640656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×240640656² = 115815850640220672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2506626 + ... + 2506721.

Almost surely, 2^240640656 is an apocalyptic number.

It is an amenable number.

240640656 is an abundant number, since it is smaller than the sum of its proper divisors (381014496).

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

240640656 is a wasteful number, since it uses less digits than its factorization.

240640656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5013358 (or 5013352 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 240640656 is about 15512.5966878534. The cubic root of 240640656 is about 621.9989729893.

Adding to 240640656 its reverse (656046042), we get a palindrome (896686698).

The spelling of 240640656 in words is "two hundred forty million, six hundred forty thousand, six hundred fifty-six".