1261676780 has 96 divisors (see below), whose sum is σ = 3271726080. Its totient is φ = 397981440.

The previous prime is 1261676771. The next prime is 1261676791. The reversal of 1261676780 is 876761621.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 652415 + ... + 654345.

It is an arithmetic number, because the mean of its divisors is an integer number (34080480).

Almost surely, 2^1261676780 is an apocalyptic number.

1261676780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1261676780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1635863040).

1261676780 is an abundant number, since it is smaller than the sum of its proper divisors (2010049300).

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

1261676780 is a wasteful number, since it uses less digits than its factorization.

1261676780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319 (or 2317 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 1261676780 is about 35520.0898084450. The cubic root of 1261676780 is about 1080.5612023866.

The spelling of 1261676780 in words is "one billion, two hundred sixty-one million, six hundred seventy-six thousand, seven hundred eighty".