1285812256 has 24 divisors (see below), whose sum is σ = 2532252240. Its totient is φ = 642700608.

The previous prime is 1285812239. The next prime is 1285812301. The reversal of 1285812256 is 6522185821.

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, 168655 + ... + 176113.

It is an arithmetic number, because the mean of its divisors is an integer number (105510510).

Almost surely, 2^1285812256 is an apocalyptic number.

1285812256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1285812256 is a deficient number, since it is larger than the sum of its proper divisors (1246439984).

1285812256 is an equidigital number, since it uses as much as digits as its factorization.

1285812256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12856 (or 12848 counting only the distinct ones).

The product of its digits is 76800, while the sum is 40.

The square root of 1285812256 is about 35858.2243843724. The cubic root of 1285812256 is about 1087.4079914407.

The spelling of 1285812256 in words is "one billion, two hundred eighty-five million, eight hundred twelve thousand, two hundred fifty-six".