261820228 has 12 divisors (see below), whose sum is σ = 482300560. Its totient is φ = 124020072.

The previous prime is 261820193. The next prime is 261820271. The reversal of 261820228 is 822028162.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 261820228.

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, 1722426 + ... + 1722577.

Almost surely, 2^261820228 is an apocalyptic number.

It is an amenable number.

261820228 is a deficient number, since it is larger than the sum of its proper divisors (220480332).

261820228 is a wasteful number, since it uses less digits than its factorization.

261820228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3445026 (or 3445024 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 261820228 is about 16180.8599277047. The cubic root of 261820228 is about 639.7364051207.

The spelling of 261820228 in words is "two hundred sixty-one million, eight hundred twenty thousand, two hundred twenty-eight".