285287860 has 96 divisors (see below), whose sum is σ = 734614272. Its totient is φ = 91576320.

The previous prime is 285287857. The next prime is 285287861. The reversal of 285287860 is 68782582.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 285287860.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285287861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63612 + ... + 67948.

It is an arithmetic number, because the mean of its divisors is an integer number (7652232).

Almost surely, 2^285287860 is an apocalyptic number.

285287860 is a gapful number since it is divisible by the number (20) 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 285287860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (367307136).

285287860 is an abundant number, since it is smaller than the sum of its proper divisors (449326412).

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

285287860 is a wasteful number, since it uses less digits than its factorization.

285287860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4393 (or 4391 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 46.

The square root of 285287860 is about 16890.4665418099. The cubic root of 285287860 is about 658.3059247611.

The spelling of 285287860 in words is "two hundred eighty-five million, two hundred eighty-seven thousand, eight hundred sixty".