261210330 has 48 divisors (see below), whose sum is σ = 686171304. Its totient is φ = 68935680.

The previous prime is 261210319. The next prime is 261210359. The reversal of 261210330 is 33012162.

261210330 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 217769049 + 43441281 = 14757^2 + 6591^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6231 + ... + 23690.

Almost surely, 2^261210330 is an apocalyptic number.

261210330 is an abundant number, since it is smaller than the sum of its proper divisors (424960974).

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

261210330 is a wasteful number, since it uses less digits than its factorization.

261210330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30031 (or 30028 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 261210330 is about 16162.0026605616. The cubic root of 261210330 is about 639.2392735410.

Adding to 261210330 its reverse (33012162), we get a palindrome (294222492).

The spelling of 261210330 in words is "two hundred sixty-one million, two hundred ten thousand, three hundred thirty".