228491540 has 12 divisors (see below), whose sum is σ = 479832276. Its totient is φ = 91396608.

The previous prime is 228491521. The next prime is 228491567. The reversal of 228491540 is 45194822.

It can be written as a sum of positive squares in 2 ways, for example, as 90288004 + 138203536 = 9502^2 + 11756^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 228491540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5712269 + ... + 5712308.

It is an arithmetic number, because the mean of its divisors is an integer number (39986023).

Almost surely, 2^228491540 is an apocalyptic number.

228491540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228491540 is an abundant number, since it is smaller than the sum of its proper divisors (251340736).

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

228491540 is a wasteful number, since it uses less digits than its factorization.

228491540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11424586 (or 11424584 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 228491540 is about 15115.9366233125. The cubic root of 228491540 is about 611.3501760225.

It can be divided in two parts, 22849 and 1540, that added together give a cube (24389 = 29³).

The spelling of 228491540 in words is "two hundred twenty-eight million, four hundred ninety-one thousand, five hundred forty".