6489620865 has 48 divisors (see below), whose sum is σ = 13844533248. Its totient is φ = 2738475648.

The previous prime is 6489620857. The next prime is 6489620909. The reversal of 6489620865 is 5680269846.

It is a happy number.

6489620865 is a `hidden beast` number, since 6 + 4 + 8 + 9 + 620 + 8 + 6 + 5 = 666.

It is not a de Polignac number, because 6489620865 - 2³ = 6489620857 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 788289 + ... + 796478.

It is an arithmetic number, because the mean of its divisors is an integer number (288427776).

Almost surely, 2^6489620865 is an apocalyptic number.

6489620865 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6489620865 is an abundant number, since it is smaller than the sum of its proper divisors (7354912383).

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

6489620865 is a wasteful number, since it uses less digits than its factorization.

6489620865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584798 (or 1584795 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The square root of 6489620865 is about 80558.1831038908. The cubic root of 6489620865 is about 1865.2617098059.

The spelling of 6489620865 in words is "six billion, four hundred eighty-nine million, six hundred twenty thousand, eight hundred sixty-five".