285889770 has 128 divisors (see below), whose sum is σ = 837734400. Its totient is φ = 69056064.

The previous prime is 285889739. The next prime is 285889777. The reversal of 285889770 is 77988582.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (285889777) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 116779 + ... + 119201.

It is an arithmetic number, because the mean of its divisors is an integer number (6544800).

Almost surely, 2^285889770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285889770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (418867200).

285889770 is an abundant number, since it is smaller than the sum of its proper divisors (551844630).

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

285889770 is a wasteful number, since it uses less digits than its factorization.

285889770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481 (or 2475 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 54.

The square root of 285889770 is about 16908.2751929344. The cubic root of 285889770 is about 658.7685715977.

The spelling of 285889770 in words is "two hundred eighty-five million, eight hundred eighty-nine thousand, seven hundred seventy".