855645880 has 32 divisors (see below), whose sum is σ = 1987309440. Its totient is φ = 331217280.

The previous prime is 855645859. The next prime is 855645883. The reversal of 855645880 is 88546558.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855645883) 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, 343779 + ... + 346258.

It is an arithmetic number, because the mean of its divisors is an integer number (62103420).

Almost surely, 2^855645880 is an apocalyptic number.

It is an amenable number.

855645880 is an abundant number, since it is smaller than the sum of its proper divisors (1131663560).

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

855645880 is a wasteful number, since it uses less digits than its factorization.

855645880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690079 (or 690075 counting only the distinct ones).

The product of its (nonzero) digits is 1536000, while the sum is 49.

The square root of 855645880 is about 29251.4252644209. The cubic root of 855645880 is about 949.3609293773.

The spelling of 855645880 in words is "eight hundred fifty-five million, six hundred forty-five thousand, eight hundred eighty".