8057647721 has 8 divisors (see below), whose sum is σ = 8131177224. Its totient is φ = 7984157440.

The previous prime is 8057647693. The next prime is 8057647723. The reversal of 8057647721 is 1277467508.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1437547225 + 6620100496 = 37915^2 + 81364^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8057647721 - 2¹⁸ = 8057385577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8057647723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 543791 + ... + 558411.

It is an arithmetic number, because the mean of its divisors is an integer number (1016397153).

Almost surely, 2^8057647721 is an apocalyptic number.

It is an amenable number.

8057647721 is a deficient number, since it is larger than the sum of its proper divisors (73529503).

8057647721 is a wasteful number, since it uses less digits than its factorization.

8057647721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19611.

The product of its (nonzero) digits is 658560, while the sum is 47.

The square root of 8057647721 is about 89764.4011900040. The cubic root of 8057647721 is about 2004.7924836276.

The spelling of 8057647721 in words is "eight billion, fifty-seven million, six hundred forty-seven thousand, seven hundred twenty-one".