6440286040 has 32 divisors (see below), whose sum is σ = 14492934000. Its totient is φ = 2575707264.

The previous prime is 6440286011. The next prime is 6440286067. The reversal of 6440286040 is 406820446.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6440285987 and 6440286005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 464326 + ... + 477994.

Almost surely, 2^6440286040 is an apocalyptic number.

It is an amenable number.

6440286040 is an abundant number, since it is smaller than the sum of its proper divisors (8052647960).

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

6440286040 is a wasteful number, since it uses less digits than its factorization.

6440286040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25459 (or 25455 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 6440286040 is about 80251.3927604998. The cubic root of 6440286040 is about 1860.5230386306.

The spelling of 6440286040 in words is "six billion, four hundred forty million, two hundred eighty-six thousand, forty".