1309788660 has 48 divisors (see below), whose sum is σ = 3693816000. Its totient is φ = 346761984.

The previous prime is 1309788653. The next prime is 1309788661. The reversal of 1309788660 is 668879031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309788661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70185 + ... + 86864.

It is an arithmetic number, because the mean of its divisors is an integer number (76954500).

Almost surely, 2^1309788660 is an apocalyptic number.

1309788660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1309788660 is an abundant number, since it is smaller than the sum of its proper divisors (2384027340).

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

1309788660 is a wasteful number, since it uses less digits than its factorization.

1309788660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157200 (or 157198 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 1309788660 is about 36191.0024729904. The cubic root of 1309788660 is about 1094.1253372614.

The spelling of 1309788660 in words is "one billion, three hundred nine million, seven hundred eighty-eight thousand, six hundred sixty".