240020010243640 has 128 divisors (see below), whose sum is σ = 591962112403200. Its totient is φ = 86862211476480.

The previous prime is 240020010243623. The next prime is 240020010243743. The reversal of 240020010243640 is 46342010020042.

It is a junction number, because it is equal to n+sod(n) for n = 240020010243599 and 240020010243608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 260926831 + ... + 261845089.

It is an arithmetic number, because the mean of its divisors is an integer number (4624704003150).

Almost surely, 2^{240020010243640} is an apocalyptic number.

240020010243640 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 240020010243640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295981056201600).

240020010243640 is an abundant number, since it is smaller than the sum of its proper divisors (351942102159560).

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

240020010243640 is a wasteful number, since it uses less digits than its factorization.

240020010243640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921125 (or 921121 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 240020010243640 its reverse (46342010020042), we get a palindrome (286362020263682).

The spelling of 240020010243640 in words is "two hundred forty trillion, twenty billion, ten million, two hundred forty-three thousand, six hundred forty".