42855660 has 72 divisors (see below), whose sum is σ = 133189056. Its totient is φ = 11147520.

The previous prime is 42855581. The next prime is 42855661. The reversal of 42855660 is 6655824.

42855660 is a `hidden beast` number, since 42 + 8 + 556 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (42855661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4477 + ... + 10283.

It is an arithmetic number, because the mean of its divisors is an integer number (1849848).

Almost surely, 2^42855660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42855660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66594528).

42855660 is an abundant number, since it is smaller than the sum of its proper divisors (90333396).

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

42855660 is a wasteful number, since it uses less digits than its factorization.

42855660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5863 (or 5858 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 42855660 is about 6546.4234510151. The cubic root of 42855660 is about 349.9473662349.

The spelling of 42855660 in words is "forty-two million, eight hundred fifty-five thousand, six hundred sixty".