285971690 has 32 divisors (see below), whose sum is σ = 520914240. Its totient is φ = 113027200.

The previous prime is 285971689. The next prime is 285971711. The reversal of 285971690 is 96179582.

It is a super-2 number, since 2×285971690² = 163559614962912200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 548630 + ... + 549150.

It is an arithmetic number, because the mean of its divisors is an integer number (16278570).

Almost surely, 2^285971690 is an apocalyptic number.

285971690 is a deficient number, since it is larger than the sum of its proper divisors (234942550).

285971690 is a wasteful number, since it uses less digits than its factorization.

285971690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 285971690 is about 16910.6975018773. The cubic root of 285971690 is about 658.8314876505.

The spelling of 285971690 in words is "two hundred eighty-five million, nine hundred seventy-one thousand, six hundred ninety".