285390216 has 80 divisors (see below), whose sum is σ = 825200640. Its totient is φ = 92054880.

The previous prime is 285390211. The next prime is 285390221. The reversal of 285390216 is 612093582.

It is an interprime number because it is at equal distance from previous prime (285390211) and next prime (285390221).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (285390211) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12985 + ... + 27191.

It is an arithmetic number, because the mean of its divisors is an integer number (10315008).

Almost surely, 2^285390216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285390216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (412600320).

285390216 is an abundant number, since it is smaller than the sum of its proper divisors (539810424).

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

285390216 is a wasteful number, since it uses less digits than its factorization.

285390216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14256 (or 14243 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 285390216 is about 16893.4962633553. The cubic root of 285390216 is about 658.3846446716.

The spelling of 285390216 in words is "two hundred eighty-five million, three hundred ninety thousand, two hundred sixteen".