42611220 has 36 divisors (see below), whose sum is σ = 129254580. Its totient is φ = 11362944.

The previous prime is 42611209. The next prime is 42611221. The reversal of 42611220 is 2211624.

It can be written as a sum of positive squares in 2 ways, for example, as 9847044 + 32764176 = 3138^2 + 5724^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 42611193 and 42611202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42611221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118185 + ... + 118544.

It is an arithmetic number, because the mean of its divisors is an integer number (3590405).

Almost surely, 2^42611220 is an apocalyptic number.

It is an amenable number.

42611220 is an abundant number, since it is smaller than the sum of its proper divisors (86643360).

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

42611220 is a wasteful number, since it uses less digits than its factorization.

42611220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236744 (or 236739 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 42611220 is about 6527.7270163511. The cubic root of 42611220 is about 349.2807542637.

Adding to 42611220 its reverse (2211624), we get a palindrome (44822844).

The spelling of 42611220 in words is "forty-two million, six hundred eleven thousand, two hundred twenty".