1255788660 has 144 divisors (see below), whose sum is σ = 4305752640. Its totient is φ = 271918080.

The previous prime is 1255788659. The next prime is 1255788697. The reversal of 1255788660 is 668875521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44620 + ... + 67100.

It is an arithmetic number, because the mean of its divisors is an integer number (29901060).

Almost surely, 2^1255788660 is an apocalyptic number.

1255788660 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 1255788660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2152876320).

1255788660 is an abundant number, since it is smaller than the sum of its proper divisors (3049963980).

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

1255788660 is a wasteful number, since it uses less digits than its factorization.

1255788660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22526 (or 22517 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 48.

The square root of 1255788660 is about 35437.1085163561. The cubic root of 1255788660 is about 1078.8776234257.

The spelling of 1255788660 in words is "one billion, two hundred fifty-five million, seven hundred eighty-eight thousand, six hundred sixty".