7688577221 has 16 divisors (see below), whose sum is σ = 8761482240. Its totient is φ = 6688370880.

The previous prime is 7688577209. The next prime is 7688577229. The reversal of 7688577221 is 1227758867.

It is not a de Polignac number, because 7688577221 - 2⁶ = 7688577157 is a prime.

It is a super-2 number, since 2×7688577221² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7688577229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34310 + ... + 128663.

It is an arithmetic number, because the mean of its divisors is an integer number (547592640).

Almost surely, 2^7688577221 is an apocalyptic number.

It is an amenable number.

7688577221 is a deficient number, since it is larger than the sum of its proper divisors (1072905019).

7688577221 is a wasteful number, since it uses less digits than its factorization.

7688577221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163196.

The product of its digits is 2634240, while the sum is 53.

The square root of 7688577221 is about 87684.5323931194. The cubic root of 7688577221 is about 1973.7038739105.

The spelling of 7688577221 in words is "seven billion, six hundred eighty-eight million, five hundred seventy-seven thousand, two hundred twenty-one".