7720647057 has 8 divisors (see below), whose sum is σ = 11437995680. Its totient is φ = 5147098020.

The previous prime is 7720647041. The next prime is 7720647059. The reversal of 7720647057 is 7507460277.

It is not a de Polignac number, because 7720647057 - 2⁴ = 7720647041 is a prime.

It is a super-2 number, since 2×7720647057² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7720647059) 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, 142974919 + ... + 142974972.

It is an arithmetic number, because the mean of its divisors is an integer number (1429749460).

Almost surely, 2^7720647057 is an apocalyptic number.

It is an amenable number.

7720647057 is a deficient number, since it is larger than the sum of its proper divisors (3717348623).

7720647057 is a wasteful number, since it uses less digits than its factorization.

7720647057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285949900 (or 285949894 counting only the distinct ones).

The product of its (nonzero) digits is 576240, while the sum is 45.

The square root of 7720647057 is about 87867.2126393002. The cubic root of 7720647057 is about 1976.4442403840. Note that the first 3 decimals are identical.

The spelling of 7720647057 in words is "seven billion, seven hundred twenty million, six hundred forty-seven thousand, fifty-seven".