285985700 has 144 divisors (see below), whose sum is σ = 833529984. Its totient is φ = 82252800.

The previous prime is 285985669. The next prime is 285985709. The reversal of 285985700 is 7589582.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (285985709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 98672 + ... + 101528.

Almost surely, 2^285985700 is an apocalyptic number.

285985700 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 285985700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (416764992).

285985700 is an abundant number, since it is smaller than the sum of its proper divisors (547544284).

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

285985700 is a wasteful number, since it uses less digits than its factorization.

285985700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2902 (or 2895 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 285985700 is about 16911.1117316396. Note that the first 3 decimals coincide. The cubic root of 285985700 is about 658.8422463826.

The spelling of 285985700 in words is "two hundred eighty-five million, nine hundred eighty-five thousand, seven hundred".