6621460640 has 48 divisors (see below), whose sum is σ = 16024758120. Its totient is φ = 2583982080.

The previous prime is 6621460633. The next prime is 6621460667. The reversal of 6621460640 is 460641266.

It can be written as a sum of positive squares in 4 ways, for example, as 4076056336 + 2545404304 = 63844^2 + 50452^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6621460640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498125 + ... + 511244.

Almost surely, 2^6621460640 is an apocalyptic number.

It is an amenable number.

6621460640 is an abundant number, since it is smaller than the sum of its proper divisors (9403297480).

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

6621460640 is a wasteful number, since it uses less digits than its factorization.

6621460640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009425 (or 1009417 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 6621460640 is about 81372.3579601820. The cubic root of 6621460640 is about 1877.8083559581.

The spelling of 6621460640 in words is "six billion, six hundred twenty-one million, four hundred sixty thousand, six hundred forty".