610531220 has 24 divisors (see below), whose sum is σ = 1380740424. Its totient is φ = 225426816.

The previous prime is 610531153. The next prime is 610531223. The reversal of 610531220 is 22135016.

It can be written as a sum of positive squares in 4 ways, for example, as 12630916 + 597900304 = 3554^2 + 24452^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 610531192 and 610531201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (610531223) 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, 1173839 + ... + 1174358.

It is an arithmetic number, because the mean of its divisors is an integer number (57530851).

Almost surely, 2^610531220 is an apocalyptic number.

It is an amenable number.

610531220 is an abundant number, since it is smaller than the sum of its proper divisors (770209204).

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

610531220 is a wasteful number, since it uses less digits than its factorization.

610531220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2348219 (or 2348217 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 610531220 is about 24708.9299646909. The cubic root of 610531220 is about 848.3387252636.

Adding to 610531220 its reverse (22135016), we get a palindrome (632666236).

The spelling of 610531220 in words is "six hundred ten million, five hundred thirty-one thousand, two hundred twenty".