856921760 has 24 divisors (see below), whose sum is σ = 2024478036. Its totient is φ = 342768640.

The previous prime is 856921757. The next prime is 856921763. The reversal of 856921760 is 67129658.

It is an interprime number because it is at equal distance from previous prime (856921757) and next prime (856921763).

It can be written as a sum of positive squares in 2 ways, for example, as 852873616 + 4048144 = 29204^2 + 2012^2 .

It is a super-2 number, since 2×856921760² = 1468629805522995200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (856921763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2677721 + ... + 2678040.

Almost surely, 2^856921760 is an apocalyptic number.

856921760 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

856921760 is an abundant number, since it is smaller than the sum of its proper divisors (1167556276).

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

856921760 is a wasteful number, since it uses less digits than its factorization.

856921760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5355776 (or 5355768 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 856921760 is about 29273.2259923637. The cubic root of 856921760 is about 949.8325688311.

The spelling of 856921760 in words is "eight hundred fifty-six million, nine hundred twenty-one thousand, seven hundred sixty".