6438987499 has 8 divisors (see below), whose sum is σ = 7365774080. Its totient is φ = 5513933736.

The previous prime is 6438987487. The next prime is 6438987559. The reversal of 6438987499 is 9947898346.

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

It is a cyclic number.

It is not a de Polignac number, because 6438987499 - 2⁹ = 6438986987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6438987299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425229 + ... + 440110.

It is an arithmetic number, because the mean of its divisors is an integer number (920721760).

Almost surely, 2^6438987499 is an apocalyptic number.

6438987499 is a deficient number, since it is larger than the sum of its proper divisors (926786581).

6438987499 is a wasteful number, since it uses less digits than its factorization.

6438987499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866409.

The product of its digits is 94058496, while the sum is 67.

The square root of 6438987499 is about 80243.3018949245. The cubic root of 6438987499 is about 1860.3979858082.

The spelling of 6438987499 in words is "six billion, four hundred thirty-eight million, nine hundred eighty-seven thousand, four hundred ninety-nine".