42545220 has 96 divisors (see below), whose sum is σ = 128677248. Its totient is φ = 10463232.

The previous prime is 42545183. The next prime is 42545221. The reversal of 42545220 is 2254524.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (42545221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53667 + ... + 54453.

It is an arithmetic number, because the mean of its divisors is an integer number (1340388).

Almost surely, 2^42545220 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 42545220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64338624).

42545220 is an abundant number, since it is smaller than the sum of its proper divisors (86132028).

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

42545220 is a wasteful number, since it uses less digits than its factorization.

42545220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 42545220 is about 6522.6696988273. The cubic root of 42545220 is about 349.1003288424.

Adding to 42545220 its reverse (2254524), we get a palindrome (44799744).

The spelling of 42545220 in words is "forty-two million, five hundred forty-five thousand, two hundred twenty".