261450220 has 24 divisors (see below), whose sum is σ = 554181264. Its totient is φ = 103601856.

The previous prime is 261450199. The next prime is 261450221. The reversal of 261450220 is 22054162.

261450220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 261450191 and 261450200.

It is not an unprimeable number, because it can be changed into a prime (261450221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58947 + ... + 63226.

It is an arithmetic number, because the mean of its divisors is an integer number (23090886).

Almost surely, 2^261450220 is an apocalyptic number.

261450220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261450220 is an abundant number, since it is smaller than the sum of its proper divisors (292731044).

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

261450220 is a wasteful number, since it uses less digits than its factorization.

261450220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122289 (or 122287 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 261450220 is about 16169.4223768198. The cubic root of 261450220 is about 639.4349015746.

The spelling of 261450220 in words is "two hundred sixty-one million, four hundred fifty thousand, two hundred twenty".