286220388 has 12 divisors (see below), whose sum is σ = 667847600. Its totient is φ = 95406792.

The previous prime is 286220377. The next prime is 286220447. The reversal of 286220388 is 883022682.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×286220388³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11925838 + ... + 11925861.

Almost surely, 2^286220388 is an apocalyptic number.

It is an amenable number.

286220388 is an abundant number, since it is smaller than the sum of its proper divisors (381627212).

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

286220388 is a wasteful number, since it uses less digits than its factorization.

286220388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23851706 (or 23851704 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 286220388 is about 16918.0491783184. The cubic root of 286220388 is about 659.0224186693.

The spelling of 286220388 in words is "two hundred eighty-six million, two hundred twenty thousand, three hundred eighty-eight".