228181840 has 40 divisors (see below), whose sum is σ = 531394560. Its totient is φ = 91122816.

The previous prime is 228181823. The next prime is 228181847. The reversal of 228181840 is 48181822.

228181840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 228181796 and 228181805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228181847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55537 + ... + 59503.

It is an arithmetic number, because the mean of its divisors is an integer number (13284864).

Almost surely, 2^228181840 is an apocalyptic number.

228181840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228181840 is an abundant number, since it is smaller than the sum of its proper divisors (303212720).

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

228181840 is a wasteful number, since it uses less digits than its factorization.

228181840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4699 (or 4693 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 34.

The square root of 228181840 is about 15105.6889945477. The cubic root of 228181840 is about 611.0738408369.

The spelling of 228181840 in words is "two hundred twenty-eight million, one hundred eighty-one thousand, eight hundred forty".