1261276672 has 60 divisors (see below), whose sum is σ = 2556918936. Its totient is φ = 621547520.

The previous prime is 1261276619. The next prime is 1261276693. The reversal of 1261276672 is 2766721621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4055397 + ... + 4055707.

Almost surely, 2^1261276672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1261276672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1278459468).

1261276672 is an abundant number, since it is smaller than the sum of its proper divisors (1295642264).

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

1261276672 is an frugal number, since it uses more digits than its factorization.

1261276672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507 (or 402 counting only the distinct ones).

The product of its digits is 84672, while the sum is 40.

The square root of 1261276672 is about 35514.4572251921. The cubic root of 1261276672 is about 1080.4469663429.

The spelling of 1261276672 in words is "one billion, two hundred sixty-one million, two hundred seventy-six thousand, six hundred seventy-two".