228293540 has 12 divisors (see below), whose sum is σ = 479416476. Its totient is φ = 91317408.

The previous prime is 228293521. The next prime is 228293551. The reversal of 228293540 is 45392822.

It can be written as a sum of positive squares in 2 ways, for example, as 168169024 + 60124516 = 12968^2 + 7754^2 .

It is a super-5 number, since 5×228293540⁵ (a number of 43 digits) contains 55555 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 228293540.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5707319 + ... + 5707358.

It is an arithmetic number, because the mean of its divisors is an integer number (39951373).

Almost surely, 2^228293540 is an apocalyptic number.

228293540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228293540 is an abundant number, since it is smaller than the sum of its proper divisors (251122936).

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

228293540 is a wasteful number, since it uses less digits than its factorization.

228293540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11414686 (or 11414684 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 228293540 is about 15109.3858247117. The cubic root of 228293540 is about 611.1735359066.

The spelling of 228293540 in words is "two hundred twenty-eight million, two hundred ninety-three thousand, five hundred forty".