6455721028 has 12 divisors (see below), whose sum is σ = 11320524432. Its totient is φ = 3221285480.

The previous prime is 6455721017. The next prime is 6455721043. The reversal of 6455721028 is 8201275546.

It is a super-2 number, since 2×6455721028² = 83352667982722753568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1641550 + ... + 1645477.

It is an arithmetic number, because the mean of its divisors is an integer number (943377036).

Almost surely, 2^6455721028 is an apocalyptic number.

It is an amenable number.

6455721028 is a deficient number, since it is larger than the sum of its proper divisors (4864803404).

6455721028 is a wasteful number, since it uses less digits than its factorization.

6455721028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3287522 (or 3287520 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 6455721028 is about 80347.5016910918. The cubic root of 6455721028 is about 1862.0081817658.

The spelling of 6455721028 in words is "six billion, four hundred fifty-five million, seven hundred twenty-one thousand, twenty-eight".