228221686 has 32 divisors (see below), whose sum is σ = 445367808. Its totient is φ = 85050240.

The previous prime is 228221641. The next prime is 228221701. The reversal of 228221686 is 686122822.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28675 + ... + 35758.

It is an arithmetic number, because the mean of its divisors is an integer number (13917744).

Almost surely, 2^228221686 is an apocalyptic number.

228221686 is a deficient number, since it is larger than the sum of its proper divisors (217146122).

228221686 is a wasteful number, since it uses less digits than its factorization.

228221686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64476.

The product of its digits is 36864, while the sum is 37.

The square root of 228221686 is about 15107.0078440438. The cubic root of 228221686 is about 611.1094081299.

The spelling of 228221686 in words is "two hundred twenty-eight million, two hundred twenty-one thousand, six hundred eighty-six".