285657111908 has 96 divisors (see below), whose sum is σ = 624064702464. Its totient is φ = 111604635648.

The previous prime is 285657111899. The next prime is 285657111917. The reversal of 285657111908 is 809111756582.

It is an interprime number because it is at equal distance from previous prime (285657111899) and next prime (285657111917).

It is a self number, because there is not a number n which added to its sum of digits gives 285657111908.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3891110 + ... + 3963842.

It is an arithmetic number, because the mean of its divisors is an integer number (6500673984).

Almost surely, 2^285657111908 is an apocalyptic number.

285657111908 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285657111908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312032351232).

285657111908 is an abundant number, since it is smaller than the sum of its proper divisors (338407590556).

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

285657111908 is a wasteful number, since it uses less digits than its factorization.

285657111908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73021 (or 73019 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 53.

Adding to 285657111908 its sum of digits (53), we get a square (285657111961 = 534469²).

The spelling of 285657111908 in words is "two hundred eighty-five billion, six hundred fifty-seven million, one hundred eleven thousand, nine hundred eight".