285109902 has 128 divisors (see below), whose sum is σ = 796262400. Its totient is φ = 73461600.

The previous prime is 285109837. The next prime is 285109997. The reversal of 285109902 is 209901582.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 793999 + ... + 794357.

It is an arithmetic number, because the mean of its divisors is an integer number (6220800).

Almost surely, 2^285109902 is an apocalyptic number.

285109902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 285109902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398131200).

285109902 is an abundant number, since it is smaller than the sum of its proper divisors (511152498).

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

285109902 is a wasteful number, since it uses less digits than its factorization.

285109902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579 (or 573 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 285109902 is about 16885.1977187121. The cubic root of 285109902 is about 658.1690160576.

The spelling of 285109902 in words is "two hundred eighty-five million, one hundred nine thousand, nine hundred two".