1285520208 has 40 divisors (see below), whose sum is σ = 3795346368. Its totient is φ = 367291392.

The previous prime is 1285520179. The next prime is 1285520219. The reversal of 1285520208 is 8020255821.

It is a congruent number.

It is an unprimeable number.

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, 1912641 + ... + 1913312.

Almost surely, 2^1285520208 is an apocalyptic number.

It is an amenable number.

1285520208 is an abundant number, since it is smaller than the sum of its proper divisors (2509826160).

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

1285520208 is a wasteful number, since it uses less digits than its factorization.

1285520208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3825971 (or 3825965 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 1285520208 is about 35854.1518934697. The cubic root of 1285520208 is about 1087.3256571356.

The spelling of 1285520208 in words is "one billion, two hundred eighty-five million, five hundred twenty thousand, two hundred eight".