285155520 has 224 divisors, whose sum is σ = 991526592. Its totient is φ = 69009408.

The previous prime is 285155491. The next prime is 285155527. The reversal of 285155520 is 25551582.

It is not an unprimeable number, because it can be changed into a prime (285155527) 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, 910884 + ... + 911196.

It is an arithmetic number, because the mean of its divisors is an integer number (4426458).

Almost surely, 2^285155520 is an apocalyptic number.

285155520 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 285155520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (495763296).

285155520 is an abundant number, since it is smaller than the sum of its proper divisors (706371072).

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

285155520 is a wasteful number, since it uses less digits than its factorization.

285155520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 33.

The square root of 285155520 is about 16886.5484928093. The cubic root of 285155520 is about 658.2041168530.

The spelling of 285155520 in words is "two hundred eighty-five million, one hundred fifty-five thousand, five hundred twenty".