1309308768 has 36 divisors (see below), whose sum is σ = 3723347628. Its totient is φ = 436436160.

The previous prime is 1309308731. The next prime is 1309308797. The reversal of 1309308768 is 8678039031.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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, 2272818 + ... + 2273393.

It is an arithmetic number, because the mean of its divisors is an integer number (103426323).

Almost surely, 2^1309308768 is an apocalyptic number.

1309308768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1309308768 is an abundant number, since it is smaller than the sum of its proper divisors (2414038860).

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

1309308768 is a wasteful number, since it uses less digits than its factorization.

1309308768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4546227 (or 4546216 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1309308768 is about 36184.3718751618. The cubic root of 1309308768 is about 1093.9916958196.

The spelling of 1309308768 in words is "one billion, three hundred nine million, three hundred eight thousand, seven hundred sixty-eight".