7881721460 has 12 divisors (see below), whose sum is σ = 16551615108. Its totient is φ = 3152688576.

The previous prime is 7881721457. The next prime is 7881721487. The reversal of 7881721460 is 641271887.

It can be written as a sum of positive squares in 2 ways, for example, as 5980238224 + 1901483236 = 77332^2 + 43606^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197043017 + ... + 197043056.

It is an arithmetic number, because the mean of its divisors is an integer number (1379301259).

Almost surely, 2^7881721460 is an apocalyptic number.

It is an amenable number.

7881721460 is an abundant number, since it is smaller than the sum of its proper divisors (8669893648).

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

7881721460 is a wasteful number, since it uses less digits than its factorization.

7881721460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394086082 (or 394086080 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 44.

The square root of 7881721460 is about 88779.0598057898. The cubic root of 7881721460 is about 1990.0944762937.

The spelling of 7881721460 in words is "seven billion, eight hundred eighty-one million, seven hundred twenty-one thousand, four hundred sixty".