261303450 has 48 divisors (see below), whose sum is σ = 654749760. Its totient is φ = 68958720.

The previous prime is 261303439. The next prime is 261303451. The reversal of 261303450 is 54303162.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 261303450.

It is not an unprimeable number, because it can be changed into a prime (261303451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5571 + ... + 23529.

It is an arithmetic number, because the mean of its divisors is an integer number (13640620).

Almost surely, 2^261303450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261303450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327374880).

261303450 is an abundant number, since it is smaller than the sum of its proper divisors (393446310).

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

261303450 is a wasteful number, since it uses less digits than its factorization.

261303450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18071 (or 18066 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 261303450 is about 16164.8832349634. The cubic root of 261303450 is about 639.3152262403.

The spelling of 261303450 in words is "two hundred sixty-one million, three hundred three thousand, four hundred fifty".