285390240 has 48 divisors (see below), whose sum is σ = 898980768. Its totient is φ = 76103936.

The previous prime is 285390229. The next prime is 285390289. The reversal of 285390240 is 42093582.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296802 + ... + 297761.

It is an arithmetic number, because the mean of its divisors is an integer number (18728766).

Almost surely, 2^285390240 is an apocalyptic number.

285390240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285390240 is an abundant number, since it is smaller than the sum of its proper divisors (613590528).

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

285390240 is a wasteful number, since it uses less digits than its factorization.

285390240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594581 (or 594573 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 285390240 is about 16893.4969736878. The cubic root of 285390240 is about 658.3846631273.

The spelling of 285390240 in words is "two hundred eighty-five million, three hundred ninety thousand, two hundred forty".