243781028 has 12 divisors (see below), whose sum is σ = 426726300. Its totient is φ = 121859232.

The previous prime is 243780997. The next prime is 243781063. The reversal of 243781028 is 820187342.

It can be written as a sum of positive squares in 2 ways, for example, as 109035364 + 134745664 = 10442^2 + 11608^2 .

It is a super-2 number, since 2×243781028² = 118858379225473568, which contains 22 as substring.

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, 25250 + ... + 33542.

It is an arithmetic number, because the mean of its divisors is an integer number (35560525).

Almost surely, 2^243781028 is an apocalyptic number.

It is an amenable number.

243781028 is a deficient number, since it is larger than the sum of its proper divisors (182945272).

243781028 is a wasteful number, since it uses less digits than its factorization.

243781028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15646 (or 15644 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 243781028 is about 15613.4886556464. The cubic root of 243781028 is about 624.6929931129.

The spelling of 243781028 in words is "two hundred forty-three million, seven hundred eighty-one thousand, twenty-eight".