7028640864 has 144 divisors (see below), whose sum is σ = 23689306368. Its totient is φ = 2008167552.

The previous prime is 7028640859. The next prime is 7028640893. The reversal of 7028640864 is 4680468207.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 10132 + ... + 118995.

It is an arithmetic number, because the mean of its divisors is an integer number (164509072).

Almost surely, 2^7028640864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7028640864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11844653184).

7028640864 is an abundant number, since it is smaller than the sum of its proper divisors (16660665504).

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

7028640864 is a wasteful number, since it uses less digits than its factorization.

7028640864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129159 (or 129139 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The square root of 7028640864 is about 83836.9898314580. The cubic root of 7028640864 is about 1915.5365850859.

The spelling of 7028640864 in words is "seven billion, twenty-eight million, six hundred forty thousand, eight hundred sixty-four".