261630204 has 96 divisors (see below), whose sum is σ = 728082432. Its totient is φ = 72192000.

The previous prime is 261630203. The next prime is 261630211. The reversal of 261630204 is 402036162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261630203) 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, 67684 + ... + 71444.

It is an arithmetic number, because the mean of its divisors is an integer number (7584192).

Almost surely, 2^261630204 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 261630204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364041216).

261630204 is an abundant number, since it is smaller than the sum of its proper divisors (466452228).

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

261630204 is a wasteful number, since it uses less digits than its factorization.

261630204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3827 (or 3825 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 261630204 is about 16174.9869860844. The cubic root of 261630204 is about 639.5815982731.

Adding to 261630204 its reverse (402036162), we get a palindrome (663666366).

The spelling of 261630204 in words is "two hundred sixty-one million, six hundred thirty thousand, two hundred four".