855641680 has 40 divisors (see below), whose sum is σ = 1991138184. Its totient is φ = 341952000.

The previous prime is 855641623. The next prime is 855641707. The reversal of 855641680 is 86146558.

It can be written as a sum of positive squares in 4 ways, for example, as 40653376 + 814988304 = 6376^2 + 28548^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99970 + ... + 108190.

Almost surely, 2^855641680 is an apocalyptic number.

855641680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

855641680 is an abundant number, since it is smaller than the sum of its proper divisors (1135496504).

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

855641680 is a wasteful number, since it uses less digits than its factorization.

855641680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9535 (or 9529 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 855641680 is about 29251.3534729592. The cubic root of 855641680 is about 949.3593760390.

The spelling of 855641680 in words is "eight hundred fifty-five million, six hundred forty-one thousand, six hundred eighty".