285708990 has 128 divisors (see below), whose sum is σ = 825292800. Its totient is φ = 61890048.

The previous prime is 285708959. The next prime is 285709001. The reversal of 285708990 is 99807582.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 719472 + ... + 719868.

It is an arithmetic number, because the mean of its divisors is an integer number (6447600).

Almost surely, 2^285708990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285708990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (412646400).

285708990 is an abundant number, since it is smaller than the sum of its proper divisors (539583810).

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

285708990 is a wasteful number, since it uses less digits than its factorization.

285708990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586.

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 285708990 is about 16902.9284445033. The cubic root of 285708990 is about 658.6296867243.

The spelling of 285708990 in words is "two hundred eighty-five million, seven hundred eight thousand, nine hundred ninety".