6440243704 has 8 divisors (see below), whose sum is σ = 12075456960. Its totient is φ = 3220121848.

The previous prime is 6440243681. The next prime is 6440243753. The reversal of 6440243704 is 4073420446.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 6440243704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402515224 + ... + 402515239.

It is an arithmetic number, because the mean of its divisors is an integer number (1509432120).

Almost surely, 2^6440243704 is an apocalyptic number.

It is an amenable number.

6440243704 is a deficient number, since it is larger than the sum of its proper divisors (5635213256).

6440243704 is a wasteful number, since it uses less digits than its factorization.

6440243704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805030469 (or 805030465 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 34.

The square root of 6440243704 is about 80251.1289889432. The cubic root of 6440243704 is about 1860.5189618306.

The spelling of 6440243704 in words is "six billion, four hundred forty million, two hundred forty-three thousand, seven hundred four".