1285793778 has 16 divisors (see below), whose sum is σ = 2594346336. Its totient is φ = 424804800.

The previous prime is 1285793777. The next prime is 1285793797. The reversal of 1285793778 is 8773975821.

It is not an unprimeable number, because it can be changed into a prime (1285793777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 947548 + ... + 948903.

It is an arithmetic number, because the mean of its divisors is an integer number (162146646).

Almost surely, 2^1285793778 is an apocalyptic number.

1285793778 is an abundant number, since it is smaller than the sum of its proper divisors (1308552558).

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

1285793778 is a wasteful number, since it uses less digits than its factorization.

1285793778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896569.

The product of its digits is 5927040, while the sum is 57.

The square root of 1285793778 is about 35857.9667298635. The cubic root of 1285793778 is about 1087.4027824840.

The spelling of 1285793778 in words is "one billion, two hundred eighty-five million, seven hundred ninety-three thousand, seven hundred seventy-eight".