1368320728 has 16 divisors (see below), whose sum is σ = 2571701760. Its totient is φ = 682533600.

The previous prime is 1368320719. The next prime is 1368320747. The reversal of 1368320728 is 8270238631.

It is a super-2 number, since 2×1368320728² = 3744603229348899968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199768 + ... + 206503.

It is an arithmetic number, because the mean of its divisors is an integer number (160731360).

Almost surely, 2^1368320728 is an apocalyptic number.

It is an amenable number.

1368320728 is a deficient number, since it is larger than the sum of its proper divisors (1203381032).

1368320728 is a wasteful number, since it uses less digits than its factorization.

1368320728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406698 (or 406694 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 1368320728 is about 36990.8195097108. The cubic root of 1368320728 is about 1110.1865682125.

The spelling of 1368320728 in words is "one billion, three hundred sixty-eight million, three hundred twenty thousand, seven hundred twenty-eight".