261220626 has 48 divisors (see below), whose sum is σ = 617853600. Its totient is φ = 82487808.

The previous prime is 261220549. The next prime is 261220627. The reversal of 261220626 is 626022162.

261220626 is a `hidden beast` number, since 2 + 6 + 12 + 20 + 626 = 666.

261220626 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261220626.

It is not an unprimeable number, because it can be changed into a prime (261220627) 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, 4911 + ... + 23378.

It is an arithmetic number, because the mean of its divisors is an integer number (12871950).

Almost surely, 2^261220626 is an apocalyptic number.

261220626 is an abundant number, since it is smaller than the sum of its proper divisors (356632974).

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

261220626 is a wasteful number, since it uses less digits than its factorization.

261220626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28325 (or 28313 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 261220626 is about 16162.3211823055. The cubic root of 261220626 is about 639.2476722914.

Adding to 261220626 its reverse (626022162), we get a palindrome (887242788).

The spelling of 261220626 in words is "two hundred sixty-one million, two hundred twenty thousand, six hundred twenty-six".