285446140 has 96 divisors (see below), whose sum is σ = 716083200. Its totient is φ = 93519360.

The previous prime is 285446131. The next prime is 285446143. The reversal of 285446140 is 41644582.

It is a junction number, because it is equal to n+sod(n) for n = 285446096 and 285446105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285446143) 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, 385891 + ... + 386629.

It is an arithmetic number, because the mean of its divisors is an integer number (7459200).

Almost surely, 2^285446140 is an apocalyptic number.

285446140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

285446140 is the 13795-th pentagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285446140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358041600).

285446140 is an abundant number, since it is smaller than the sum of its proper divisors (430637060).

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

285446140 is a wasteful number, since it uses less digits than its factorization.

285446140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875 (or 873 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 34.

The square root of 285446140 is about 16895.1513754686. The cubic root of 285446140 is about 658.4276467276.

The spelling of 285446140 in words is "two hundred eighty-five million, four hundred forty-six thousand, one hundred forty".