261722270 has 16 divisors (see below), whose sum is σ = 482591088. Its totient is φ = 102135360.

The previous prime is 261722261. The next prime is 261722281. The reversal of 261722270 is 72227162.

It is a super-2 number, since 2×261722270² = 136997093227905800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318764 + ... + 319583.

It is an arithmetic number, because the mean of its divisors is an integer number (30161943).

Almost surely, 2^261722270 is an apocalyptic number.

261722270 is a deficient number, since it is larger than the sum of its proper divisors (220868818).

261722270 is a wasteful number, since it uses less digits than its factorization.

261722270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638395.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 261722270 is about 16177.8326731364. The cubic root of 261722270 is about 639.6566110366.

The spelling of 261722270 in words is "two hundred sixty-one million, seven hundred twenty-two thousand, two hundred seventy".