1261220268 has 72 divisors (see below), whose sum is σ = 3696829696. Its totient is φ = 327587040.

The previous prime is 1261220263. The next prime is 1261220269. The reversal of 1261220268 is 8620221621.

It is not an unprimeable number, because it can be changed into a prime (1261220263) 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, 51880 + ... + 72207.

Almost surely, 2^1261220268 is an apocalyptic number.

It is an amenable number.

1261220268 is an abundant number, since it is smaller than the sum of its proper divisors (2435609428).

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

1261220268 is a wasteful number, since it uses less digits than its factorization.

1261220268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124123 (or 124110 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 1261220268 is about 35513.6631171722. The cubic root of 1261220268 is about 1080.4308603236.

Adding to 1261220268 its reverse (8620221621), we get a palindrome (9881441889).

The spelling of 1261220268 in words is "one billion, two hundred sixty-one million, two hundred twenty thousand, two hundred sixty-eight".