285991830 has 64 divisors (see below), whose sum is σ = 764510400. Its totient is φ = 76078080.

The previous prime is 285991829. The next prime is 285991837. The reversal of 285991830 is 38199582.

It is a happy number.

285991830 is a `hidden beast` number, since 28 + 599 + 1 + 8 + 30 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285991837) 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, 136390 + ... + 138470.

It is an arithmetic number, because the mean of its divisors is an integer number (11945475).

Almost surely, 2^285991830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285991830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (382255200).

285991830 is an abundant number, since it is smaller than the sum of its proper divisors (478518570).

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

285991830 is a wasteful number, since it uses less digits than its factorization.

285991830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606 (or 2600 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 285991830 is about 16911.2929724489. The cubic root of 285991830 is about 658.8469536974.

The spelling of 285991830 in words is "two hundred eighty-five million, nine hundred ninety-one thousand, eight hundred thirty".