1285779268 has 6 divisors (see below), whose sum is σ = 2250113726. Its totient is φ = 642889632.

The previous prime is 1285779263. The next prime is 1285779269. The reversal of 1285779268 is 8629775821.

It can be written as a sum of positive squares in only one way, i.e., 757790784 + 527988484 = 27528^2 + 22978^2 .

It is not an unprimeable number, because it can be changed into a prime (1285779263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160722405 + ... + 160722412.

Almost surely, 2^1285779268 is an apocalyptic number.

It is an amenable number.

1285779268 is a deficient number, since it is larger than the sum of its proper divisors (964334458).

1285779268 is a wasteful number, since it uses less digits than its factorization.

1285779268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321444821 (or 321444819 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 55.

The square root of 1285779268 is about 35857.7644032642. The cubic root of 1285779268 is about 1087.3986920733.

The spelling of 1285779268 in words is "one billion, two hundred eighty-five million, seven hundred seventy-nine thousand, two hundred sixty-eight".