285039380 has 24 divisors (see below), whose sum is σ = 613184040. Its totient is φ = 111234560.

The previous prime is 285039367. The next prime is 285039383. The reversal of 285039380 is 83930582.

It can be written as a sum of positive squares in 4 ways, for example, as 712336 + 284327044 = 844^2 + 16862^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285039383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172985 + ... + 174624.

It is an arithmetic number, because the mean of its divisors is an integer number (25549335).

Almost surely, 2^285039380 is an apocalyptic number.

285039380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285039380 is an abundant number, since it is smaller than the sum of its proper divisors (328144660).

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

285039380 is a wasteful number, since it uses less digits than its factorization.

285039380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347659 (or 347657 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 285039380 is about 16883.1093107875. The cubic root of 285039380 is about 658.1147454967.

The spelling of 285039380 in words is "two hundred eighty-five million, thirty-nine thousand, three hundred eighty".