42656220 has 144 divisors (see below), whose sum is σ = 137225088. Its totient is φ = 11119680.

The previous prime is 42656219. The next prime is 42656249. The reversal of 42656220 is 2265624.

42656220 is a `hidden beast` number, since 4 + 2 + 656 + 2 + 2 + 0 = 666.

42656220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 325555 + ... + 325685.

It is an arithmetic number, because the mean of its divisors is an integer number (952952).

Almost surely, 2^42656220 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 42656220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68612544).

42656220 is an abundant number, since it is smaller than the sum of its proper divisors (94568868).

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

42656220 is a wasteful number, since it uses less digits than its factorization.

42656220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 42656220 is about 6531.1729421292. The cubic root of 42656220 is about 349.4036648044.

The spelling of 42656220 in words is "forty-two million, six hundred fifty-six thousand, two hundred twenty".