1261619268 has 72 divisors (see below), whose sum is σ = 3687832512. Its totient is φ = 332732736.

The previous prime is 1261619251. The next prime is 1261619273. The reversal of 1261619268 is 8629161621.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 74880 + ... + 90167.

It is an arithmetic number, because the mean of its divisors is an integer number (51219896).

Almost surely, 2^1261619268 is an apocalyptic number.

It is an amenable number.

1261619268 is an abundant number, since it is smaller than the sum of its proper divisors (2426213244).

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

1261619268 is a wasteful number, since it uses less digits than its factorization.

1261619268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165081 (or 165072 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 1261619268 is about 35519.2802291938. The cubic root of 1261619268 is about 1080.5447834482.

The spelling of 1261619268 in words is "one billion, two hundred sixty-one million, six hundred nineteen thousand, two hundred sixty-eight".