7705678221 has 12 divisors (see below), whose sum is σ = 11201320572. Its totient is φ = 5104397376.

The previous prime is 7705678219. The next prime is 7705678223. The reversal of 7705678221 is 1228765077.

7705678221 is a `hidden beast` number, since 7 + 7 + 0 + 567 + 82 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (7705678219) and next prime (7705678223).

It can be written as a sum of positive squares in 2 ways, for example, as 5266404900 + 2439273321 = 72570^2 + 49389^2 .

It is not a de Polignac number, because 7705678221 - 2¹ = 7705678219 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7705678223) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2725296 + ... + 2728121.

It is an arithmetic number, because the mean of its divisors is an integer number (933443381).

Almost surely, 2^7705678221 is an apocalyptic number.

It is an amenable number.

7705678221 is a deficient number, since it is larger than the sum of its proper divisors (3495642351).

7705678221 is a wasteful number, since it uses less digits than its factorization.

7705678221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5453580 (or 5453577 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The square root of 7705678221 is about 87781.9925782048. The cubic root of 7705678221 is about 1975.1661000933.

The spelling of 7705678221 in words is "seven billion, seven hundred five million, six hundred seventy-eight thousand, two hundred twenty-one".