285509990 has 16 divisors (see below), whose sum is σ = 515970000. Its totient is φ = 113748000.

The previous prime is 285509989. The next prime is 285509999. The reversal of 285509990 is 99905582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285509999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54365 + ... + 59384.

It is an arithmetic number, because the mean of its divisors is an integer number (32248125).

Almost surely, 2^285509990 is an apocalyptic number.

285509990 is a deficient number, since it is larger than the sum of its proper divisors (230460010).

285509990 is a wasteful number, since it uses less digits than its factorization.

285509990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114007.

The product of its (nonzero) digits is 291600, while the sum is 47.

The square root of 285509990 is about 16897.0408651929. The cubic root of 285509990 is about 658.4767365150.

The spelling of 285509990 in words is "two hundred eighty-five million, five hundred nine thousand, nine hundred ninety".