6440081487 has 8 divisors (see below), whose sum is σ = 9813457536. Its totient is φ = 3680046552.

The previous prime is 6440081477. The next prime is 6440081497. The reversal of 6440081487 is 7841800446.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6440081477) and next prime (6440081497).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6440081487 - 2⁴ = 6440081471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440081477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153335253 + ... + 153335294.

It is an arithmetic number, because the mean of its divisors is an integer number (1226682192).

Almost surely, 2^6440081487 is an apocalyptic number.

6440081487 is a deficient number, since it is larger than the sum of its proper divisors (3373376049).

6440081487 is a wasteful number, since it uses less digits than its factorization.

6440081487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306670557.

The product of its (nonzero) digits is 172032, while the sum is 42.

The square root of 6440081487 is about 80250.1182989782. The cubic root of 6440081487 is about 1860.5033407686.

The spelling of 6440081487 in words is "six billion, four hundred forty million, eighty-one thousand, four hundred eighty-seven".