228021906 has 16 divisors (see below), whose sum is σ = 521193024. Its totient is φ = 65149104.

The previous prime is 228021883. The next prime is 228021919. The reversal of 228021906 is 609120822.

228021906 = T₈₀₆₈ + T₈₀₆₉ + ... + T₈₀₇₄.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2714505 + ... + 2714588.

It is an arithmetic number, because the mean of its divisors is an integer number (32574564).

Almost surely, 2^228021906 is an apocalyptic number.

228021906 is an abundant number, since it is smaller than the sum of its proper divisors (293171118).

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

228021906 is a wasteful number, since it uses less digits than its factorization.

228021906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5429105.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 228021906 is about 15100.3942332642. The cubic root of 228021906 is about 610.9310390462.

The spelling of 228021906 in words is "two hundred twenty-eight million, twenty-one thousand, nine hundred six".