6440123752 has 16 divisors (see below), whose sum is σ = 12078029700. Its totient is φ = 3219315840.

The previous prime is 6440123731. The next prime is 6440123771. The reversal of 6440123752 is 2573210446.

It can be written as a sum of positive squares in 2 ways, for example, as 5962001796 + 478121956 = 77214^2 + 21866^2 .

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, 55677 + ... + 126412.

Almost surely, 2^6440123752 is an apocalyptic number.

It is an amenable number.

6440123752 is a deficient number, since it is larger than the sum of its proper divisors (5637905948).

6440123752 is a wasteful number, since it uses less digits than its factorization.

6440123752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186516 (or 186512 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 6440123752 is about 80250.3816314913. The cubic root of 6440123752 is about 1860.5074108000.

The spelling of 6440123752 in words is "six billion, four hundred forty million, one hundred twenty-three thousand, seven hundred fifty-two".