244040007640 has 128 divisors (see below), whose sum is σ = 645593094720. Its totient is φ = 81850982400.

The previous prime is 244040007557. The next prime is 244040007647. The reversal of 244040007640 is 46700040442.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (244040007647) 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, 7539972 + ... + 7572268.

Almost surely, 2^244040007640 is an apocalyptic number.

244040007640 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 244040007640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322796547360).

244040007640 is an abundant number, since it is smaller than the sum of its proper divisors (401553087080).

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

244040007640 is a wasteful number, since it uses less digits than its factorization.

244040007640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33653 (or 33649 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 31.

The spelling of 244040007640 in words is "two hundred forty-four billion, forty million, seven thousand, six hundred forty".