228705720 has 64 divisors (see below), whose sum is σ = 687312000. Its totient is φ = 60882048.

The previous prime is 228705671. The next prime is 228705731. The reversal of 228705720 is 27507822.

228705720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 87391 + ... + 89969.

It is an arithmetic number, because the mean of its divisors is an integer number (10739250).

Almost surely, 2^228705720 is an apocalyptic number.

228705720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228705720 is an abundant number, since it is smaller than the sum of its proper divisors (458606280).

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

228705720 is a wasteful number, since it uses less digits than its factorization.

228705720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3332 (or 3328 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 228705720 is about 15123.0195397612. The cubic root of 228705720 is about 611.5411358124.

The spelling of 228705720 in words is "two hundred twenty-eight million, seven hundred five thousand, seven hundred twenty".