1268378645 has 8 divisors (see below), whose sum is σ = 1522247256. Its totient is φ = 1014574336.

The previous prime is 1268378633. The next prime is 1268378681. The reversal of 1268378645 is 5468738621.

It can be written as a sum of positive squares in 4 ways, for example, as 254019844 + 1014358801 = 15938^2 + 31849^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1268378645 - 2⁶ = 1268378581 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1268378593 and 1268378602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60449 + ... + 78681.

It is an arithmetic number, because the mean of its divisors is an integer number (190280907).

Almost surely, 2^1268378645 is an apocalyptic number.

It is an amenable number.

1268378645 is a deficient number, since it is larger than the sum of its proper divisors (253868611).

1268378645 is a wasteful number, since it uses less digits than its factorization.

1268378645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32151.

The product of its digits is 1935360, while the sum is 50.

The square root of 1268378645 is about 35614.3039381651. The cubic root of 1268378645 is about 1082.4710921099.

The spelling of 1268378645 in words is "one billion, two hundred sixty-eight million, three hundred seventy-eight thousand, six hundred forty-five".